Matej Pregelj

Jožef Stefan Institute

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Jožef Stefan Institute

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Durham University

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Matej Pregelj has a total of 261 co-authors. Here are the top co-authors by number of shared publications:

Andrej Zorko
Jozef Stefan Institute
45 shared publications
O. Zaharko
Laboratory for Neutron Scattering and Imaging, PSI, CH-5232 Villigen, Switzerland
20 shared publications
D. Arčon
Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
16 shared publications
H. Berger
École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
16 shared publications
Matjaž Gomilšek
Jozef Stefan Institute
15 shared publications
Denis Arčon
University of Ljubljana
13 shared publications

Latest Publications

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Cited by 3
- 14 May 2026
- Published by American Physical Society (APS) in Physical Review B
Spin-liquid-like spin dynamics in the frustrated antiferromagnet TbBO 3
by J. Khatua, D. Tay, T. Shiroka, M. Pregelj, K. Kargeti, S. K. Panda, G. B. G. Stenning, P. Manuel, M. D. Le, D. T. Adroja, et al.
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- 14 May 2026
- Published by American Physical Society (APS) in Physical Review B
Spin-liquid-like spin dynamics in the frustrated antiferromagnet TbBO 3
by J. Khatua, D. Tay, T. Shiroka, M. Pregelj, K. Kargeti, S. K. Panda, G. B. G. Stenning, P. Manuel, M. D. Le, D. T. Adroja, et al.
Cited by 3
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Cited by 1
- 12 December 2025
- Published by American Physical Society (APS) in Physical Review B
Coexistence of static and dynamic local magnetic fields in the distorted honeycomb lattice antiferromagnet Co 2 Te 3 O 8
by J. Khatua, Suheon Lee, M. Pregelj, Samiul Sk, S. K. Panda, Bassam Hitti, Gerald Morris, I. da Silva, Kwang-Yong Choi, P. Khuntia
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- 12 December 2025
- Published by American Physical Society (APS) in Physical Review B
Coexistence of static and dynamic local magnetic fields in the distorted honeycomb lattice antiferromagnet Co 2 Te 3 O 8
by J. Khatua, Suheon Lee, M. Pregelj, Samiul Sk, S. K. Panda, Bassam Hitti, Gerald Morris, I. da Silva, Kwang-Yong Choi, P. Khuntia
Cited by 1
Open Access
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Cited by 2
- 20 October 2025
- Published by American Physical Society (APS) in Physical Review B
Incommensurate magnetic order arising from frustrated interchain interactions in the spin- $\frac{1}{2}$ chain compound ${AgCuVO}_{4}$
by A. Hromov, A. Zorko, M. Gomilšek, I. Puente Orench, L. Keller, T. Shiroka, A. Prokofiev, M. Pregelj
Quantum spin chains with competing interactions offer a platform where low dimensionality and frustration—both acting to suppress magnetic order—intersect. We studied magnetic ordering in the spin- 1 2 chain compound AgCuVO 4 using muon spin spectroscopy and neutron diffraction. Long-range magnetic order emerges at T N = 2.0 ( 1 ) K , which is ∼ 1 / 200 of the dominant intrachain coupling J and ∼ 1 / 15 of the interchain interactions. The collinear incommensurate amplitude-modulated magnetic structure features a reduced ordered moment of 0.13 ( 3 ) µ B , confined to the a b plane and modulated along the c axis—perpendicular to the spin chains—indicating frustrated interchain couplings. The low T N , small moment, and incommensurate order highlight strong frustration, positioning AgCuVO 4 as a model system for exploring frustration in quantum spin chains.
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- 20 October 2025
- Published by American Physical Society (APS) in Physical Review B
Open Access
Incommensurate magnetic order arising from frustrated interchain interactions in the spin- $\frac{1}{2}$ chain compound ${AgCuVO}_{4}$
by A. Hromov, A. Zorko, M. Gomilšek, I. Puente Orench, L. Keller, T. Shiroka, A. Prokofiev, M. Pregelj
Quantum spin chains with competing interactions offer a platform where low dimensionality and frustration—both acting to suppress magnetic order—intersect. We studied magnetic ordering in the spin- 1 2 chain compound AgCuVO 4 using muon spin spectroscopy and neutron diffraction. Long-range magnetic order emerges at T N = 2.0 ( 1 ) K , which is ∼ 1 / 200 of the dominant intrachain coupling J and ∼ 1 / 15 of the interchain interactions. The collinear incommensurate amplitude-modulated magnetic structure features a reduced ordered moment of 0.13 ( 3 ) µ B , confined to the a b plane and modulated along the c axis—perpendicular to the spin chains—indicating frustrated interchain couplings. The low T N , small moment, and incommensurate order highlight strong frustration, positioning AgCuVO 4 as a model system for exploring frustration in quantum spin chains.
Cited by 2
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Cited by 1
- 4 June 2025
- Published by American Physical Society (APS) in Physical Review B
Pseudodoublet ground state of the non-Kramers compound ${SrTm}_{2} O_{4}$ and its frustrated antiferromagnetic interactions
by D. L. Quintero Castro, A. Bhat Kademane, M. Pregelj, R. Toft-Petersen, D. G. Mazzone, G. S. Tucker, C. Salazar Mejia, J. Gronemann, H.-F. Li
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- 4 June 2025
- Published by American Physical Society (APS) in Physical Review B
Pseudodoublet ground state of the non-Kramers compound ${SrTm}_{2} O_{4}$ and its frustrated antiferromagnetic interactions
by D. L. Quintero Castro, A. Bhat Kademane, M. Pregelj, R. Toft-Petersen, D. G. Mazzone, G. S. Tucker, C. Salazar Mejia, J. Gronemann, H.-F. Li
Cited by 1
Open Access
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Cited by 11
- 23 August 2024
- Published by Elsevier in Acta Materialia
Perpendicular magnetic anisotropy in multilayers arising from the interplay of thermal strains and diffusion-driven plastic deformation
by A. Hromov, M. Panjan, M. Tadić, A. Zorko, M. Pregelj
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- 23 August 2024
- Published by Elsevier in Acta Materialia
Open Access
Perpendicular magnetic anisotropy in multilayers arising from the interplay of thermal strains and diffusion-driven plastic deformation
by A. Hromov, M. Panjan, M. Tadić, A. Zorko, M. Pregelj
Cited by 11
Open Access
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Cited by 6
- 11 July 2024
- Published by American Physical Society (APS) in Physical Review Research
Sharp quantum phase transition in the frustrated spin-1/2 Ising chain antiferromagnet ${CaCoV}_{2} O_{7}$
by Isha, A. K. Bera, Guratinder Kaur, C. Stock, Koushik Chakraborty, Pascal Puphal, M. Isobe, K. Küster, Y. Skourski, L. Bhaskaran, et al.
We report on a quantum critical behavior in the quasi-1D spin-1/2 zigzag frustrated chain antiferromagnet ${CaCoV}_{2} O_{7}$ , induced by an applied magnetic field. Below $T_{N} = 3.3$ K our zero-field neutron diffraction studies revealed the up-up-down-down spin structure, stabilized by an order-by-disorder phenomenon. At base temperature, the magnetic order is suppressed by an applied magnetic field ( $B$ ), inducing a transition into a quantum paramagnetic state at $B_{c} = 3$ T, as revealed by both neutron diffraction and ESR data. The transition exhibits an unusually sharp phase boundary with the critical exponent $ϕ = 0.164 (3) \approx 1 / 6$ , in contrast to the earlier experimental observations for uniform spin-1/2 chain systems. Such a sharp QPT is anticipated due to a rare combination of spin-orbit coupling and competing NN and NNN exchange interactions $J_{1}$ and $J_{2}$ of the zigzag spin chain.
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- 11 July 2024
- Published by American Physical Society (APS) in Physical Review Research
Open Access
Sharp quantum phase transition in the frustrated spin-1/2 Ising chain antiferromagnet ${CaCoV}_{2} O_{7}$
by Isha, A. K. Bera, Guratinder Kaur, C. Stock, Koushik Chakraborty, Pascal Puphal, M. Isobe, K. Küster, Y. Skourski, L. Bhaskaran, et al.
We report on a quantum critical behavior in the quasi-1D spin-1/2 zigzag frustrated chain antiferromagnet ${CaCoV}_{2} O_{7}$ , induced by an applied magnetic field. Below $T_{N} = 3.3$ K our zero-field neutron diffraction studies revealed the up-up-down-down spin structure, stabilized by an order-by-disorder phenomenon. At base temperature, the magnetic order is suppressed by an applied magnetic field ( $B$ ), inducing a transition into a quantum paramagnetic state at $B_{c} = 3$ T, as revealed by both neutron diffraction and ESR data. The transition exhibits an unusually sharp phase boundary with the critical exponent $ϕ = 0.164 (3) \approx 1 / 6$ , in contrast to the earlier experimental observations for uniform spin-1/2 chain systems. Such a sharp QPT is anticipated due to a rare combination of spin-orbit coupling and competing NN and NNN exchange interactions $J_{1}$ and $J_{2}$ of the zigzag spin chain.
Cited by 6
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Cited by 24
- 20 July 2023
- Published by Elsevier in Ceramics International
Perpendicular magnetic anisotropy at room-temperature in sputtered a-Si/Ni/a-Si layered structure with thick Ni (nickel) layers
by Marin Tadić, Matjaž Panjan, Miha Čekada, Zvonko Jagličić, Matej Pregelj, Matjaž Spreitzer, Peter Panjan
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- 20 July 2023
- Published by Elsevier in Ceramics International
Perpendicular magnetic anisotropy at room-temperature in sputtered a-Si/Ni/a-Si layered structure with thick Ni (nickel) layers
by Marin Tadić, Matjaž Panjan, Miha Čekada, Zvonko Jagličić, Matej Pregelj, Matjaž Spreitzer, Peter Panjan
Cited by 24
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Cited by 38
- 9 September 2022
- Published by American Physical Society (APS) in Physical Review B
Magnetic properties of the triangular-lattice antiferromagnets ${Ba}_{3} {R B}_{9} O_{18}$ $(R = Yb, Er)$
by J. Khatua, M. Pregelj, A. Elghandour, Z. Jagličic, R. Klingeler, A. Zorko, P. Khuntia
Frustration-induced strong quantum fluctuations, spin correlations, and interplay between competing degrees of freedom are some of the key ingredients that underlie exotic states with fractional excitations in quantum materials. Rare-earth-based two-dimensional magnetic lattices possessing a crystal electric field, spin-orbit coupling, anisotropy, and electron correlation between rare-earth moments offer a new paradigm in this context. Herein, we present crystal structure, magnetic susceptibility, and specific heat results accompanied by crystal electric field calculations on polycrystalline samples of ${Ba}_{3} {R B}_{9} O_{18}$ $(R = Yb, Er)$ , in which $R^{3 +}$ ions form a perfect triangular lattice. The localized $R^{3 +}$ spins show neither long-range magnetic order nor spin-glass behavior down to 1.9 K in ${Ba}_{3} {R B}_{9} O_{18}$ . Magnetization data reveal pseudospin $J_{eff} = 1 / 2$ $({Yb}^{3 +})$ degrees of freedom in the Kramers doublet state and a weak antiferromagnetic interaction between $J_{eff} = 1 / 2$ moments in the Yb variant. On the other hand, the effective moment $μ_{eff} = 8.8 μ_{B}$ was obtained from the Curie-Weiss fit of the low-temperature susceptibility data in ${Ba}_{3} {ErB}_{9} O_{18}$ , which suggests the admixture of higher-crystal-electric-field states with the ground state. The Curie-Weiss fit of low-temperature susceptibility data for the Er system unveils the presence of a bit stronger antiferromagnetic interaction between ${Er}^{3 +}$ moments compared with its ${Yb}^{3 +}$ analog. ${Ba}_{3} {ErB}_{9} O_{18}$ does not show long-range magnetic order down to 500 mK. Furthermore, our crystal electric field calculations based on the thermodynamic data suggest the presence of a small gap between the ground and first excited Kramers doublets. The broad maximum around 4 K in the specific heat at zero field is attributed to the thermal population of the first crystal electric field excited state in ${Ba}_{3} {ErB}_{9} O_{18}$ .
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- 9 September 2022
- Published by American Physical Society (APS) in Physical Review B
Magnetic properties of the triangular-lattice antiferromagnets ${Ba}_{3} {R B}_{9} O_{18}$ $(R = Yb, Er)$
by J. Khatua, M. Pregelj, A. Elghandour, Z. Jagličic, R. Klingeler, A. Zorko, P. Khuntia
Frustration-induced strong quantum fluctuations, spin correlations, and interplay between competing degrees of freedom are some of the key ingredients that underlie exotic states with fractional excitations in quantum materials. Rare-earth-based two-dimensional magnetic lattices possessing a crystal electric field, spin-orbit coupling, anisotropy, and electron correlation between rare-earth moments offer a new paradigm in this context. Herein, we present crystal structure, magnetic susceptibility, and specific heat results accompanied by crystal electric field calculations on polycrystalline samples of ${Ba}_{3} {R B}_{9} O_{18}$ $(R = Yb, Er)$ , in which $R^{3 +}$ ions form a perfect triangular lattice. The localized $R^{3 +}$ spins show neither long-range magnetic order nor spin-glass behavior down to 1.9 K in ${Ba}_{3} {R B}_{9} O_{18}$ . Magnetization data reveal pseudospin $J_{eff} = 1 / 2$ $({Yb}^{3 +})$ degrees of freedom in the Kramers doublet state and a weak antiferromagnetic interaction between $J_{eff} = 1 / 2$ moments in the Yb variant. On the other hand, the effective moment $μ_{eff} = 8.8 μ_{B}$ was obtained from the Curie-Weiss fit of the low-temperature susceptibility data in ${Ba}_{3} {ErB}_{9} O_{18}$ , which suggests the admixture of higher-crystal-electric-field states with the ground state. The Curie-Weiss fit of low-temperature susceptibility data for the Er system unveils the presence of a bit stronger antiferromagnetic interaction between ${Er}^{3 +}$ moments compared with its ${Yb}^{3 +}$ analog. ${Ba}_{3} {ErB}_{9} O_{18}$ does not show long-range magnetic order down to 500 mK. Furthermore, our crystal electric field calculations based on the thermodynamic data suggest the presence of a small gap between the ground and first excited Kramers doublets. The broad maximum around 4 K in the specific heat at zero field is attributed to the thermal population of the first crystal electric field excited state in ${Ba}_{3} {ErB}_{9} O_{18}$ .
Cited by 38
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Cited by 2
- 26 January 2022
- Published by American Physical Society (APS) in Physical Review B
Competing magnetic phases in the frustrated spin-1/2 chain compound $β − {TeVO}_{4}$ probed by NMR
by M. Pregelj, A. Zorko, D. Arčon, M. Klanjšek, N. Janša, P. Jeglič, O. Zaharko, S. Krämer, M. Horvatić, A. Prokofiev
In frustrated spin-1/2 chains the competition between the nearest- and next-nearest-neighbor exchange interactions leads to a rich phase diagram that becomes even richer in the presence of perturbations in their material realizations. These effects are still largely unexplored, so that new insight into static and dynamic magnetism, in particular by sensitive local probes, is highly desired. Here we present a comprehensive ${}^{17}O$ nuclear magnetic resonance study of $β − {TeVO}_{4}$ , where the anisotropy of the main exchange interactions and additional weak interchain exchange interactions complement the theoretical phase diagram. Our results confirm the dynamical nature of the intriguing spin-stripe phase that has been reported in previous studies. In addition, we find that the magnetic order in the high-field phase, which develops just below the magnetization saturation, is consistent with an unusual type of spin-density-wave (SDW) order with different alignments of the magnetic moments on the neighboring chains. This is reminiscent of the ordering in the SDW phase, realized in the absence of the magnetic field, and is thus most likely stabilized by magnetic anisotropy.
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- 26 January 2022
- Published by American Physical Society (APS) in Physical Review B
Competing magnetic phases in the frustrated spin-1/2 chain compound $β − {TeVO}_{4}$ probed by NMR
by M. Pregelj, A. Zorko, D. Arčon, M. Klanjšek, N. Janša, P. Jeglič, O. Zaharko, S. Krämer, M. Horvatić, A. Prokofiev
In frustrated spin-1/2 chains the competition between the nearest- and next-nearest-neighbor exchange interactions leads to a rich phase diagram that becomes even richer in the presence of perturbations in their material realizations. These effects are still largely unexplored, so that new insight into static and dynamic magnetism, in particular by sensitive local probes, is highly desired. Here we present a comprehensive ${}^{17}O$ nuclear magnetic resonance study of $β − {TeVO}_{4}$ , where the anisotropy of the main exchange interactions and additional weak interchain exchange interactions complement the theoretical phase diagram. Our results confirm the dynamical nature of the intriguing spin-stripe phase that has been reported in previous studies. In addition, we find that the magnetic order in the high-field phase, which develops just below the magnetization saturation, is consistent with an unusual type of spin-density-wave (SDW) order with different alignments of the magnetic moments on the neighboring chains. This is reminiscent of the ordering in the SDW phase, realized in the absence of the magnetic field, and is thus most likely stabilized by magnetic anisotropy.
Cited by 2
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Cited by 144
- 30 December 2021
- Published by Springer Nature in Nature Materials
The Ising triangular-lattice antiferromagnet neodymium heptatantalate as a quantum spin liquid candidate
by T. Arh, B. Sana, M. Pregelj, P. Khuntia, Z. Jagličić, M. D. Le, P. K. Biswas, P. Manuel, L. Mangin-Thro, A. Ozarowski, et al.
Disordered magnetic states known as spin liquids are of paramount importance in both fundamental and applied science. A classical state of this kind was predicted for the Ising antiferromagnetic triangular model, while additional non-commuting exchange terms were proposed to induce its quantum version—a quantum spin liquid. However, these predictions have not yet been confirmed experimentally. Here, we report evidence for such a state in the triangular-lattice antiferromagnet NdTa₇O₁₉. We determine its magnetic ground state, which is characterized by effective spin-1/2 degrees of freedom with Ising-like nearest-neighbour correlations and gives rise to spin excitations persisting down to the lowest accessible temperature of 40 mK. Our study demonstrates the key role of strong spin–orbit coupling in stabilizing spin liquids that result from magnetic anisotropy and highlights the large family of rare-earth (RE) heptatantalates RETa₇O₁₉ as a framework for realization of these states, which represent a promising platform for quantum applications.
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- 30 December 2021
- Published by Springer Nature in Nature Materials
The Ising triangular-lattice antiferromagnet neodymium heptatantalate as a quantum spin liquid candidate
by T. Arh, B. Sana, M. Pregelj, P. Khuntia, Z. Jagličić, M. D. Le, P. K. Biswas, P. Manuel, L. Mangin-Thro, A. Ozarowski, et al.
Disordered magnetic states known as spin liquids are of paramount importance in both fundamental and applied science. A classical state of this kind was predicted for the Ising antiferromagnetic triangular model, while additional non-commuting exchange terms were proposed to induce its quantum version—a quantum spin liquid. However, these predictions have not yet been confirmed experimentally. Here, we report evidence for such a state in the triangular-lattice antiferromagnet NdTa₇O₁₉. We determine its magnetic ground state, which is characterized by effective spin-1/2 degrees of freedom with Ising-like nearest-neighbour correlations and gives rise to spin excitations persisting down to the lowest accessible temperature of 40 mK. Our study demonstrates the key role of strong spin–orbit coupling in stabilizing spin liquids that result from magnetic anisotropy and highlights the large family of rare-earth (RE) heptatantalates RETa₇O₁₉ as a framework for realization of these states, which represent a promising platform for quantum applications.
Cited by 144

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