Yong Liu

École Polytechnique Fédérale de Lausanne

*This is an algorithmically generated author record based on publicly available information.

See Latest Publications

See Most Cited Publications

SciProfiles

ORCID Profile

Google Scholar

Current Organizations / Institutes

The organizations/institutes from the scholar's latest article

École Polytechnique Fédérale de Lausanne

Previous Organizations / Institutes

The organizations / institutes from the scholar's other articles in the past ten years

Research Subjects

Superconductivity

Research Interests

Yong Liu has a total of 226 co-authors. Here are the top co-authors by number of shared publications:

Makariy A. Tanatar
Ames National Laboratory
9 shared publications
Ruslan Prozorov
Ames National Laboratory
9 shared publications
Thomas A. Lograsso
US DOE, Div Mat Sci & Engn, Ames Lab, Ames, IA 50011 USA
8 shared publications
Thomas A. Lograsso
Ames Laboratory (AMES), Ames, IA (United States)
7 shared publications
David Vaknin
Ames National Laboratory
6 shared publications
T. A. Lograsso
Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, USA
6 shared publications

Latest Publications

Sort by

Open Access
Website
Google Scholar
Cited by 1
- 6 February 2026
- Published by American Physical Society (APS) in Physical Review X
Inducing Ferroquadrupolar Order with Applied Magnetic Field in TbPO 4
by Paola Caterina Forino, Jens Jensen, Jian Rui Soh, Sonia Francoual, Oksana Zaharko, Steffen Sloth, Alexandra Turrini, Ralf Feyerherm, Karel Prokes, Sofie Holm-Janas, et al.
In this work, we demonstrate a remarkable field-induced ferroquadrupolar phase emanating from the magnetoelastic coupling. Using synchrotron x-ray and neutron diffraction, heat capacity measurements, as well as mean-field modeling, we show that above the critical magnetic field, ferroquadrupolar O 2 − 2 order is stabilized as the main order parameter, in competition with the field-induced magnetic polarization. This is revealed by a severe lattice distortion and the suppression of antiferromagnetic ordering of the dipole moments. Even in zero magnetic field, the previously reported antiferromagnetic order is a mixed quadrupolar-dipolar phase, further highlighting the crucial role of spin-lattice interactions. This complete understanding of the magnetoelastic phase diagram establishes TbPO 4 as a model system for studying nematic-antiferromagnetic transitions and provides key Hamiltonian parameters for its description.
Website
Google Scholar
- 6 February 2026
- Published by American Physical Society (APS) in Physical Review X
Open Access
Inducing Ferroquadrupolar Order with Applied Magnetic Field in TbPO 4
by Paola Caterina Forino, Jens Jensen, Jian Rui Soh, Sonia Francoual, Oksana Zaharko, Steffen Sloth, Alexandra Turrini, Ralf Feyerherm, Karel Prokes, Sofie Holm-Janas, et al.
In this work, we demonstrate a remarkable field-induced ferroquadrupolar phase emanating from the magnetoelastic coupling. Using synchrotron x-ray and neutron diffraction, heat capacity measurements, as well as mean-field modeling, we show that above the critical magnetic field, ferroquadrupolar O 2 − 2 order is stabilized as the main order parameter, in competition with the field-induced magnetic polarization. This is revealed by a severe lattice distortion and the suppression of antiferromagnetic ordering of the dipole moments. Even in zero magnetic field, the previously reported antiferromagnetic order is a mixed quadrupolar-dipolar phase, further highlighting the crucial role of spin-lattice interactions. This complete understanding of the magnetoelastic phase diagram establishes TbPO 4 as a model system for studying nematic-antiferromagnetic transitions and provides key Hamiltonian parameters for its description.
Cited by 1
Open Access
Website
Google Scholar
Cited by 1
- 5 March 2025
- Published by IOP Publishing in Journal of Physics: Materials
Suppression of ferromagnetic correlations in hole-doped SrCo₂As₂
by M Morena, A Van Der Spuy, Y Liu, R Warmbier, Abhishek Pandey
We report the growth of high-quality single crystals of hole-doped composition Sr 0.95 K 0.05 Co 2 As 2 and present an investigation of its structural, electronic, thermal, and magnetic properties. Our results show that hole doping leads to a substantial suppression of ferromagnetic (FM) correlations present in SrCo 2 As 2 leading to nearly isotropic magnetic susceptibilities χ a b , c ( T ) of Sr 0.95 K 0.05 Co 2 As 2 . The presence of FM fluctuations is considered one of the detrimental reasons why SrCo 2 As 2 does not achieve a superconducting ground state despite having a precursor for it in the form of stripe-like antiferromagnetic fluctuations. The suppression of FM fluctuations leads to qualitative similarities between the properties of hole-doped SrCo 2 As 2 and the end member of superconducting 122 iron-arsenide family KFe₂As₂. Our results also infer the presence of strongly correlated electronic states in Sr 0.95 K 0.05 Co 2 As 2 . Further, they show that the electronic structure of SrCo 2 As 2 as well as this hole-doped composition is exceptionally unstable in the vicinity of Fermi level E F for small alterations in the structural parameters and sensitively depends upon the details of simulation.
Website
Google Scholar
- 5 March 2025
- Published by IOP Publishing in Journal of Physics: Materials
Open Access
Suppression of ferromagnetic correlations in hole-doped SrCo₂As₂
by M Morena, A Van Der Spuy, Y Liu, R Warmbier, Abhishek Pandey
We report the growth of high-quality single crystals of hole-doped composition Sr 0.95 K 0.05 Co 2 As 2 and present an investigation of its structural, electronic, thermal, and magnetic properties. Our results show that hole doping leads to a substantial suppression of ferromagnetic (FM) correlations present in SrCo 2 As 2 leading to nearly isotropic magnetic susceptibilities χ a b , c ( T ) of Sr 0.95 K 0.05 Co 2 As 2 . The presence of FM fluctuations is considered one of the detrimental reasons why SrCo 2 As 2 does not achieve a superconducting ground state despite having a precursor for it in the form of stripe-like antiferromagnetic fluctuations. The suppression of FM fluctuations leads to qualitative similarities between the properties of hole-doped SrCo 2 As 2 and the end member of superconducting 122 iron-arsenide family KFe₂As₂. Our results also infer the presence of strongly correlated electronic states in Sr 0.95 K 0.05 Co 2 As 2 . Further, they show that the electronic structure of SrCo 2 As 2 as well as this hole-doped composition is exceptionally unstable in the vicinity of Fermi level E F for small alterations in the structural parameters and sensitively depends upon the details of simulation.
Cited by 1
Open Access
Website
Google Scholar
- 25 December 2024
- Published by MDPI AG in Crystals
Advances in Crystal Growth: Pioneering Materials for Tomorrow’s Technologies
by Yong Liu, David Wenhua Bi, Arnaud Magrez
Crystal growth is inherently multidisciplinary, encompassing fields such as thermodynamics and kinetics, fluid dynamics, solution and solid-state chemistry, process engineering, and defects engineering to name a few
Website
Google Scholar
- 25 December 2024
- Published by MDPI AG in Crystals
Open Access
Advances in Crystal Growth: Pioneering Materials for Tomorrow’s Technologies
by Yong Liu, David Wenhua Bi, Arnaud Magrez
Crystal growth is inherently multidisciplinary, encompassing fields such as thermodynamics and kinetics, fluid dynamics, solution and solid-state chemistry, process engineering, and defects engineering to name a few
Open Access
Website
Google Scholar
Cited by 2
- 16 November 2024
- Published by MDPI AG in Crystals
Growth and Characterization of High-Quality YTiO₃ Single Crystals: Minimizing Ti⁴⁺ Containing Impurities and TiN Formation
by Yong Liu, David Wenhua Bi, Arnaud Magrez
We report the growth of YTiO₃ single crystals using different starting materials with the nominal compositions, (1) stoichiometric YTiO₃; (2) oxygen deficient YTiO_2.925; (3) oxygen deficient YTiO_2.85, and different atmospheres, (1) 97%Ar/3%H₂; (2) Ar; (3) forming gas 95%N₂/5%H₂, using the laser floating zone growth technique. The oxygen-deficient starting materials were prepared by mixing Y₂O₃, Ti₂O₃, and Ti powder according to the YTiO_3-δ stoichiometry. The addition of Ti powder to the starting materials effectively reacts with the oxygen in the floating zone furnace chamber, reducing Ti⁴⁺ ion-containing impurities. High-quality YTiO₃ single crystals with (2 0 0) facet were grown from the starting materials corresponding to the nominal composition YTiO_2.925. YTiO₃ single crystals grown from different starting materials are characteristic of oxygen content of 3 in both pure crystals and crystals containing impurities, revealed by the same oxygen occupancy in single crystal X-ray diffraction measurements. When forming gas was used, a golden TiN coating formed on the surface of rod.
Website
Google Scholar
- 16 November 2024
- Published by MDPI AG in Crystals
Open Access
Growth and Characterization of High-Quality YTiO₃ Single Crystals: Minimizing Ti⁴⁺ Containing Impurities and TiN Formation
by Yong Liu, David Wenhua Bi, Arnaud Magrez
We report the growth of YTiO₃ single crystals using different starting materials with the nominal compositions, (1) stoichiometric YTiO₃; (2) oxygen deficient YTiO_2.925; (3) oxygen deficient YTiO_2.85, and different atmospheres, (1) 97%Ar/3%H₂; (2) Ar; (3) forming gas 95%N₂/5%H₂, using the laser floating zone growth technique. The oxygen-deficient starting materials were prepared by mixing Y₂O₃, Ti₂O₃, and Ti powder according to the YTiO_3-δ stoichiometry. The addition of Ti powder to the starting materials effectively reacts with the oxygen in the floating zone furnace chamber, reducing Ti⁴⁺ ion-containing impurities. High-quality YTiO₃ single crystals with (2 0 0) facet were grown from the starting materials corresponding to the nominal composition YTiO_2.925. YTiO₃ single crystals grown from different starting materials are characteristic of oxygen content of 3 in both pure crystals and crystals containing impurities, revealed by the same oxygen occupancy in single crystal X-ray diffraction measurements. When forming gas was used, a golden TiN coating formed on the surface of rod.
Cited by 2
Open Access
Website
Google Scholar
Cited by 1
- 10 May 2024
- Published by International Union of Crystallography (IUCr) in Acta Crystallographica Section E Crystallographic Communications
High-resolution crystal structure of the double nitrate hydrate [La(NO₃)₆]₂[Ni(H₂O)₆]₃·6H₂O
by David Wenhua Bi, Yong Liu, Arnaud Magrez
This study introduces bis[hexakis(nitrato-κ2O,O′)lanthanum(III)] tris[hexaaquanickel(II)] hexahydrate, [La(NO3)6]2[Ni(H2O)6]3·6H2O, with a structure refined in the hexagonal space group R\overline{3}. The salt comprises [La(NO3)6]3− icosahedra and [Ni(H2O)6]2+ octahedra, thus forming an intricate network of interpenetrating honeycomb lattices arranged in layers. This arrangement is stabilized through strong hydrogen bonds. Two successive layers are connected via the second [Ni(H2O)6]2+ octahedra, forming sheets which are stacked perpendicular to the c axis and held in the crystal by van der Waals forces. The synthesis of [La(NO3)6]2[Ni(H2O)6]3·6H2O involves dissolving lanthanum(III) and nickel(II) oxides in nitric acid, followed by slow evaporation, yielding green hexagonal plate-like crystals.
Website
Google Scholar
- 10 May 2024
- Published by International Union of Crystallography (IUCr) in Acta Crystallographica Section E Crystallographic Communications
Open Access
High-resolution crystal structure of the double nitrate hydrate [La(NO₃)₆]₂[Ni(H₂O)₆]₃·6H₂O
by David Wenhua Bi, Yong Liu, Arnaud Magrez
This study introduces bis[hexakis(nitrato-κ2O,O′)lanthanum(III)] tris[hexaaquanickel(II)] hexahydrate, [La(NO3)6]2[Ni(H2O)6]3·6H2O, with a structure refined in the hexagonal space group R\overline{3}. The salt comprises [La(NO3)6]3− icosahedra and [Ni(H2O)6]2+ octahedra, thus forming an intricate network of interpenetrating honeycomb lattices arranged in layers. This arrangement is stabilized through strong hydrogen bonds. Two successive layers are connected via the second [Ni(H2O)6]2+ octahedra, forming sheets which are stacked perpendicular to the c axis and held in the crystal by van der Waals forces. The synthesis of [La(NO3)6]2[Ni(H2O)6]3·6H2O involves dissolving lanthanum(III) and nickel(II) oxides in nitric acid, followed by slow evaporation, yielding green hexagonal plate-like crystals.
Cited by 1
Open Access
Website
Google Scholar
Cited by 3
- 22 June 2023
- Published by MDPI AG in Materials
Ion-Selective Scattering Studied Using the Variable-Energy Electron Irradiation in the Ba_0.2K_0.8Fe₂As₂ Superconductor
by Kyuil Cho, Marcin Kończykowski, Makariy A. Tanatar, Igor I. Mazin, Yong Liu, Thomas A. Lograsso, Ruslan Prozorov
Low-temperature variable-energy electron irradiation was used to induce non-magnetic disorder in a single crystal of a hole-doped iron-based superconductor, Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ , x = 0.80. To avoid systematic errors, the beam energy was adjusted non-consequently for five values between 1.0 and 2.5 MeV when sample resistance was measured in situ at 22 K. For all energies, the resistivity raises linearly with the irradiation fluence suggesting the creation of uncorrelated dilute point-like disorder (confirmed by simulations). The rate of the resistivity increase peaks at energies below 1.5 MeV. Comparison with calculated partial cross-sections points to the predominant creation of defects in the iron sublattice. Simultaneously, superconducting $T_{c}$ , measured separately between the irradiation runs, is monotonically suppressed as expected, since it depends on the total scattering rate, hence on the total cross-section, which is a monotonically increasing function of the energy. Our work experimentally confirms an often-made assumption of the dominant role of the iron sub-lattice in iron-based superconductors.
Website
Google Scholar
- 22 June 2023
- Published by MDPI AG in Materials
Open Access
Ion-Selective Scattering Studied Using the Variable-Energy Electron Irradiation in the Ba_0.2K_0.8Fe₂As₂ Superconductor
by Kyuil Cho, Marcin Kończykowski, Makariy A. Tanatar, Igor I. Mazin, Yong Liu, Thomas A. Lograsso, Ruslan Prozorov
Low-temperature variable-energy electron irradiation was used to induce non-magnetic disorder in a single crystal of a hole-doped iron-based superconductor, Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ , x = 0.80. To avoid systematic errors, the beam energy was adjusted non-consequently for five values between 1.0 and 2.5 MeV when sample resistance was measured in situ at 22 K. For all energies, the resistivity raises linearly with the irradiation fluence suggesting the creation of uncorrelated dilute point-like disorder (confirmed by simulations). The rate of the resistivity increase peaks at energies below 1.5 MeV. Comparison with calculated partial cross-sections points to the predominant creation of defects in the iron sublattice. Simultaneously, superconducting $T_{c}$ , measured separately between the irradiation runs, is monotonically suppressed as expected, since it depends on the total scattering rate, hence on the total cross-section, which is a monotonically increasing function of the energy. Our work experimentally confirms an often-made assumption of the dominant role of the iron sub-lattice in iron-based superconductors.
Cited by 3
Website
Google Scholar
Cited by 20
- 21 July 2022
- Published by American Physical Society (APS) in Physical Review B
Canted antiferromagnetic phases in the candidate layered Weyl material ${EuMnSb}_{2}$
by J. M. Wilde, S. X. M. Riberolles, Atreyee Das, Y. Liu, T. W. Heitmann, X. Wang, W. E. Straszheim, S. L. Bud'KO, P. C. Canfield, A. Kreyssig, et al.
${EuMnSb}_{2}$ is a candidate topological material which can be tuned towards a Weyl semimetal, but there are differing reports for its antiferromagnetic (AFM) phases. The coupling of bands dominated by pure Sb layers hosting topological fermions to Mn and Eu magnetic states provides a potential path to tune the topological properties. Here we present single-crystal neutron diffraction, magnetization, and heat-capacity data as well as polycrystalline ${}^{151}{Eu}$ Mössbauer data which show that three AFM phases exist as a function of temperature, and we present a detailed analysis of the magnetic structure in each phase. The Mn magnetic sublattice orders into a C-type AFM structure below $T_{N_{Mn}} = 323 (1) K$ with the ordered Mn magnetic moment $μ_{Mn}$ lying perpendicular to the layers. AFM ordering of the Eu sublattice occurs below $T_{N_{Eu1}} = 23 (1) K$ with the ordered Eu magnetic moment $μ_{Eu}$ canted away from the layer normal and $μ_{Mn}$ retaining its higher temperature order. $μ_{Eu}$ is ferromagnetically aligned within each Eu layer but exhibits a complicated AFM layer stacking. Both of these higher-temperature phases are described by magnetic space group (MSG) $P n^{'} m^{'} a^{'}$ with the chemical and magnetic unit cells having the same dimensions. Cooling below $T_{N_{Eu2}} = 9 (1) K$ reveals a third AFM phase where $μ_{Mn}$ remains unchanged but $μ_{Eu}$ develops an additional substantial in-plane canting. This phase has MSG $P 11 \frac{2_{1}}{a^{'}}$ . We also find some evidence of short-range magnetic correlations associated with the Eu between $12 K ≲ T ≲ 30 K$ . Using the determined magnetic structures, we postulate the signs of nearest-neighbor intralayer and interlayer exchange constants and the magnetic anisotropy within a general Heisenberg model. We then discuss implications of the various AFM states in ${EuMnSb}_{2}$ and their potential for tuning topological properties.
Website
Google Scholar
- 21 July 2022
- Published by American Physical Society (APS) in Physical Review B
Canted antiferromagnetic phases in the candidate layered Weyl material ${EuMnSb}_{2}$
by J. M. Wilde, S. X. M. Riberolles, Atreyee Das, Y. Liu, T. W. Heitmann, X. Wang, W. E. Straszheim, S. L. Bud'KO, P. C. Canfield, A. Kreyssig, et al.
${EuMnSb}_{2}$ is a candidate topological material which can be tuned towards a Weyl semimetal, but there are differing reports for its antiferromagnetic (AFM) phases. The coupling of bands dominated by pure Sb layers hosting topological fermions to Mn and Eu magnetic states provides a potential path to tune the topological properties. Here we present single-crystal neutron diffraction, magnetization, and heat-capacity data as well as polycrystalline ${}^{151}{Eu}$ Mössbauer data which show that three AFM phases exist as a function of temperature, and we present a detailed analysis of the magnetic structure in each phase. The Mn magnetic sublattice orders into a C-type AFM structure below $T_{N_{Mn}} = 323 (1) K$ with the ordered Mn magnetic moment $μ_{Mn}$ lying perpendicular to the layers. AFM ordering of the Eu sublattice occurs below $T_{N_{Eu1}} = 23 (1) K$ with the ordered Eu magnetic moment $μ_{Eu}$ canted away from the layer normal and $μ_{Mn}$ retaining its higher temperature order. $μ_{Eu}$ is ferromagnetically aligned within each Eu layer but exhibits a complicated AFM layer stacking. Both of these higher-temperature phases are described by magnetic space group (MSG) $P n^{'} m^{'} a^{'}$ with the chemical and magnetic unit cells having the same dimensions. Cooling below $T_{N_{Eu2}} = 9 (1) K$ reveals a third AFM phase where $μ_{Mn}$ remains unchanged but $μ_{Eu}$ develops an additional substantial in-plane canting. This phase has MSG $P 11 \frac{2_{1}}{a^{'}}$ . We also find some evidence of short-range magnetic correlations associated with the Eu between $12 K ≲ T ≲ 30 K$ . Using the determined magnetic structures, we postulate the signs of nearest-neighbor intralayer and interlayer exchange constants and the magnetic anisotropy within a general Heisenberg model. We then discuss implications of the various AFM states in ${EuMnSb}_{2}$ and their potential for tuning topological properties.
Cited by 20
Website
Google Scholar
Cited by 7
- 1 July 2022
- Published by American Physical Society (APS) in Physical Review Materials
${KCo}_{2} {As}_{2}$ : A new portal for the physics of high-purity metals
by Abhishek Pandey, Y. Liu, Saroj L. Samal, Yevhen Kushnirenko, A. Kaminski, D. J. Singh, D. C. Johnston
High-quality single crystals of ${KCo}_{2} {As}_{2}$ with the body-centered tetragonal ${ThCr}_{2} {Si}_{2}$ structure were grown using KAs self flux. Structural, magnetic, thermal, and electrical transport properties were investigated. No clear evidence for any phase transitions was found in the temperature range 2–300 K. The in-plane electrical resistivity $ρ$ versus temperature $T$ is highly unusual, showing a $T^{4}$ behavior below 30 K and an anomalous positive curvature up to 300 K, which is different from the linear behavior expected from the Bloch-Grüneisen theory for electron scattering by acoustic phonons. This positive curvature has been previously observed in the in-plane resistivity of high-conductivity layered delafossites such as ${PdCoO}_{2}$ and ${PtCoO}_{2}$ . The in-plane $ρ (T \to 0) = 0.36 μ Ω$ cm of ${KCo}_{2} {As}_{2}$ is exceptionally small for this class of compounds. The material also exhibits a magnetoresistance at low $T$ which attains a value of about 40% at $T = 2$ K and magnetic field $H = 80$ kOe. The magnetic susceptibility $χ$ of ${KCo}_{2} {As}_{2}$ is isotropic and about an order of magnitude smaller than the values for the related compounds ${SrCo}_{2} {As}_{2}$ and ${BaCo}_{2} {As}_{2}$ . The $χ$ increases above 100 K, which is found from our first-principles calculations to arise from a sharp peak in the electronic density of states just above the Fermi energy $E_{F}$ . Heat capacity $C_{p} (T)$ data at low $T$ yield an electronic density of states $N (E_{F})$ that is about 36% larger than predicted by the first-principles theory. The $C_{p} (T)$ data near room temperature suggest the presence of excited optic vibration modes, which may also be the source of the positive curvature in $ρ (T)$ . Angle-resolved photoemission spectroscopy measurements are compared with the theoretical predictions of the band structure and Fermi surfaces. Our results show that ${KCo}_{2} {As}_{2}$ provides a new avenue for investigating the physics of high-purity metals.
Website
Google Scholar
- 1 July 2022
- Published by American Physical Society (APS) in Physical Review Materials
${KCo}_{2} {As}_{2}$ : A new portal for the physics of high-purity metals
by Abhishek Pandey, Y. Liu, Saroj L. Samal, Yevhen Kushnirenko, A. Kaminski, D. J. Singh, D. C. Johnston
High-quality single crystals of ${KCo}_{2} {As}_{2}$ with the body-centered tetragonal ${ThCr}_{2} {Si}_{2}$ structure were grown using KAs self flux. Structural, magnetic, thermal, and electrical transport properties were investigated. No clear evidence for any phase transitions was found in the temperature range 2–300 K. The in-plane electrical resistivity $ρ$ versus temperature $T$ is highly unusual, showing a $T^{4}$ behavior below 30 K and an anomalous positive curvature up to 300 K, which is different from the linear behavior expected from the Bloch-Grüneisen theory for electron scattering by acoustic phonons. This positive curvature has been previously observed in the in-plane resistivity of high-conductivity layered delafossites such as ${PdCoO}_{2}$ and ${PtCoO}_{2}$ . The in-plane $ρ (T \to 0) = 0.36 μ Ω$ cm of ${KCo}_{2} {As}_{2}$ is exceptionally small for this class of compounds. The material also exhibits a magnetoresistance at low $T$ which attains a value of about 40% at $T = 2$ K and magnetic field $H = 80$ kOe. The magnetic susceptibility $χ$ of ${KCo}_{2} {As}_{2}$ is isotropic and about an order of magnitude smaller than the values for the related compounds ${SrCo}_{2} {As}_{2}$ and ${BaCo}_{2} {As}_{2}$ . The $χ$ increases above 100 K, which is found from our first-principles calculations to arise from a sharp peak in the electronic density of states just above the Fermi energy $E_{F}$ . Heat capacity $C_{p} (T)$ data at low $T$ yield an electronic density of states $N (E_{F})$ that is about 36% larger than predicted by the first-principles theory. The $C_{p} (T)$ data near room temperature suggest the presence of excited optic vibration modes, which may also be the source of the positive curvature in $ρ (T)$ . Angle-resolved photoemission spectroscopy measurements are compared with the theoretical predictions of the band structure and Fermi surfaces. Our results show that ${KCo}_{2} {As}_{2}$ provides a new avenue for investigating the physics of high-purity metals.
Cited by 7
Website
Google Scholar
Cited by 5
- 7 March 2022
- Published by American Physical Society (APS) in Physical Review B
Magnetization reversal driven by electron localization-delocalization crossover in the inverse spinel ${Co}_{2} {VO}_{4}$
by Abhijit Bhat Kademane, Churna Bhandari, Durga Paudyal, Stephen Cottrell, Pinaki Das, Yong Liu, Yuen Yiu, C. M. Naveen Kumar, Konrad Siemensmeyer, Andreas Hoser, et al.
Neutron diffraction, magnetization, and muon spin relaxation measurements, supplemented by density functional theory (DFT) calculations are employed to unravel temperature-driven magnetization reversal in inverse spinel ${Co}_{2} {VO}_{4}$ . All measurements show a second-order magnetic phase transition at $T_{C} = 168 K$ to a collinear ferrimagnetic phase. Neutron diffraction measurements reveal two antiparallel ferromagnetic (FM) sublattices, belonging to magnetic ions on two distinct crystal lattice sites, where the relative balance between the two sublattices determine the net FM moment in the unit cell. As the evolution of the ordered moment with temperature differs between the two sublattices, the net magnetic moment reaches a maximum at $T_{NC} = 138 K$ and reverses its sign at $T_{MR} = 65 K$ . The DFT results suggest that the underlying microscopic mechanism for the reversal is a delocalization of the unfilled $3 d$ -shell electrons on one sublattice just below $T_{C}$ , followed by a gradual localization as the temperature is lowered. This delocalized-localized crossover is supported by muon spectroscopy results, as strong $T_{1}$ relaxation observed below $T_{C}$ indicates fluctuating internal fields.
Website
Google Scholar
- 7 March 2022
- Published by American Physical Society (APS) in Physical Review B
Magnetization reversal driven by electron localization-delocalization crossover in the inverse spinel ${Co}_{2} {VO}_{4}$
by Abhijit Bhat Kademane, Churna Bhandari, Durga Paudyal, Stephen Cottrell, Pinaki Das, Yong Liu, Yuen Yiu, C. M. Naveen Kumar, Konrad Siemensmeyer, Andreas Hoser, et al.
Neutron diffraction, magnetization, and muon spin relaxation measurements, supplemented by density functional theory (DFT) calculations are employed to unravel temperature-driven magnetization reversal in inverse spinel ${Co}_{2} {VO}_{4}$ . All measurements show a second-order magnetic phase transition at $T_{C} = 168 K$ to a collinear ferrimagnetic phase. Neutron diffraction measurements reveal two antiparallel ferromagnetic (FM) sublattices, belonging to magnetic ions on two distinct crystal lattice sites, where the relative balance between the two sublattices determine the net FM moment in the unit cell. As the evolution of the ordered moment with temperature differs between the two sublattices, the net magnetic moment reaches a maximum at $T_{NC} = 138 K$ and reverses its sign at $T_{MR} = 65 K$ . The DFT results suggest that the underlying microscopic mechanism for the reversal is a delocalization of the unfilled $3 d$ -shell electrons on one sublattice just below $T_{C}$ , followed by a gradual localization as the temperature is lowered. This delocalized-localized crossover is supported by muon spectroscopy results, as strong $T_{1}$ relaxation observed below $T_{C}$ indicates fluctuating internal fields.
Cited by 5
Website
Google Scholar
Cited by 1
- 13 October 2020
- Published by American Physical Society (APS) in Physical Review B
Effect of controlled pointlike disorder induced by 2.5-MeV electron irradiation on the nematic resistivity anisotropy of hole-doped $(Ba, K) {Fe}_{2} {As}_{2}$
by M. A. Tanatar, Erik I. Timmons, M. Kończykowski, O. Cavani, Kyuil Cho, Yong Liu, T. A. Lograsso, R. Prozorov
In-plane anisotropy of electrical resistivity was studied in samples of the hole-doped ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ in the composition range $0.21 \leq x \leq 0.26$ where anisotropy changes sign. Low-temperature ( $\sim 20$ K) irradiation with relativistic 2.5 MeV electrons was used to control the level of disorder and residual resistivity of the samples. Modification of the stress-detwinning technique enabled measurements of the same samples before and after irradiation, leading to the conclusion of anisotropic character of predominantly inelastic scattering processes. Our main finding is that the resistivity anisotropy is of the same sign irrespective of residual resistivity, and remains the same in the orthorhombic $C_{2}$ phase above the reentrant tetragonal transition. Unusual $T$ -linear dependence of the anisotropy $Δ ρ \equiv ρ_{a} (T) - ρ_{b} (T)$ is found in pristine samples with $x = 0.213$ and $x = 0.219$ , without similar signatures in either $ρ_{a} (T)$ or $ρ_{b} (T)$ . We show that this feature can be reproduced by a phenomenological model of R. M. Fernandes et al. [ Phys. Rev. Lett. 107, 217002 (2011)]. We speculate that onset of fluctuations of nematic order on approaching the instability towards the reentrant tetragonal phase contributes to this unusual dependence.
Website
Google Scholar
- 13 October 2020
- Published by American Physical Society (APS) in Physical Review B
Effect of controlled pointlike disorder induced by 2.5-MeV electron irradiation on the nematic resistivity anisotropy of hole-doped $(Ba, K) {Fe}_{2} {As}_{2}$
by M. A. Tanatar, Erik I. Timmons, M. Kończykowski, O. Cavani, Kyuil Cho, Yong Liu, T. A. Lograsso, R. Prozorov
In-plane anisotropy of electrical resistivity was studied in samples of the hole-doped ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ in the composition range $0.21 \leq x \leq 0.26$ where anisotropy changes sign. Low-temperature ( $\sim 20$ K) irradiation with relativistic 2.5 MeV electrons was used to control the level of disorder and residual resistivity of the samples. Modification of the stress-detwinning technique enabled measurements of the same samples before and after irradiation, leading to the conclusion of anisotropic character of predominantly inelastic scattering processes. Our main finding is that the resistivity anisotropy is of the same sign irrespective of residual resistivity, and remains the same in the orthorhombic $C_{2}$ phase above the reentrant tetragonal transition. Unusual $T$ -linear dependence of the anisotropy $Δ ρ \equiv ρ_{a} (T) - ρ_{b} (T)$ is found in pristine samples with $x = 0.213$ and $x = 0.219$ , without similar signatures in either $ρ_{a} (T)$ or $ρ_{b} (T)$ . We show that this feature can be reproduced by a phenomenological model of R. M. Fernandes et al. [ Phys. Rev. Lett. 107, 217002 (2011)]. We speculate that onset of fluctuations of nematic order on approaching the instability towards the reentrant tetragonal phase contributes to this unusual dependence.
Cited by 1

Show all