D. -H. Lu

Stanford Synchrotron Radiation Lightsource

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D. -H. Lu has a total of 113 co-authors. Here are the top co-authors by number of shared publications:

M. Hashimoto
Stanford Synchrotron Radiation Lightsource
11 shared publications
M. Yi
Rice University
9 shared publications
Z.-X. Shen
Stanford Institute of Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
8 shared publications
Z. Hussain
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
7 shared publications
Zhi-Xun Shen
Stanford University
7 shared publications
Sung-Kwan Mo
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
5 shared publications

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Cited by 17
- 11 June 2024
- Published by American Physical Society (APS) in Physical Review X
Orbital Ingredients and Persistent Dirac Surface State for the Topological Band Structure in ${FeTe}_{0.55} {Se}_{0.45}$
by Y.-F. Li, S.-D. Chen, M. García-Díez, M. I. Iraola, H. Pfau, Y.-L. Zhu, Z.-Q. Mao, T. Chen, M. Yi, P.-C. Dai, et al.
${FeTe}_{0.55} {Se}_{0.45}$ (FTS) occupies a special spot in modern condensed matter physics at the intersections of electron correlation, topology, and unconventional superconductivity. The bulk electronic structure of FTS is predicted to be topologically nontrivial due to the band inversion between the $d_{x z}$ and $p_{z}$ bands along $Γ − Z$ . However, there remain debates in both the authenticity of the Dirac surface states (DSSs) and the experimental deviations of band structure from the theoretical band inversion picture. Here we resolve these debates through a comprehensive angle-resolved photoemission spectroscopy investigation. We first observe a persistent DSS independent of $k_{z}$ . Then, by comparing FTS with FeSe, which has no band inversion along $Γ − Z$ , we identify the spectral weight fingerprint of both the presence of the $p_{z}$ band and the inversion between the $d_{x z}$ and $p_{z}$ bands. Furthermore, we propose a renormalization scheme for the band structure under the framework of a tight-binding model preserving crystal symmetry. Our results highlight the significant influence of correlation on modifying the band structure and make a strong case for the existence of topological band structure in this unconventional superconductor.
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- 11 June 2024
- Published by American Physical Society (APS) in Physical Review X
Open Access
Orbital Ingredients and Persistent Dirac Surface State for the Topological Band Structure in ${FeTe}_{0.55} {Se}_{0.45}$
by Y.-F. Li, S.-D. Chen, M. García-Díez, M. I. Iraola, H. Pfau, Y.-L. Zhu, Z.-Q. Mao, T. Chen, M. Yi, P.-C. Dai, et al.
${FeTe}_{0.55} {Se}_{0.45}$ (FTS) occupies a special spot in modern condensed matter physics at the intersections of electron correlation, topology, and unconventional superconductivity. The bulk electronic structure of FTS is predicted to be topologically nontrivial due to the band inversion between the $d_{x z}$ and $p_{z}$ bands along $Γ − Z$ . However, there remain debates in both the authenticity of the Dirac surface states (DSSs) and the experimental deviations of band structure from the theoretical band inversion picture. Here we resolve these debates through a comprehensive angle-resolved photoemission spectroscopy investigation. We first observe a persistent DSS independent of $k_{z}$ . Then, by comparing FTS with FeSe, which has no band inversion along $Γ − Z$ , we identify the spectral weight fingerprint of both the presence of the $p_{z}$ band and the inversion between the $d_{x z}$ and $p_{z}$ bands. Furthermore, we propose a renormalization scheme for the band structure under the framework of a tight-binding model preserving crystal symmetry. Our results highlight the significant influence of correlation on modifying the band structure and make a strong case for the existence of topological band structure in this unconventional superconductor.
Cited by 17
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- 23 August 2023
- Published by arXiv in arXiv
Spectroscopic evidence for topological band structure in FeTe$_{0.55}$Se$_{0.45}$
by Y. -F. Li, S. -D. Chen, M. Garcia-Diez, M. I. Iraola, H. Pfau, Y. -L. Zhu, Z. -Q. Mao, T. Chen, M. Yi, P. -C. Dai, et al.
FeTe$_{0.55}$Se$_{0.45}$(FTS) occupies a special spot in modern condensed matter physics at the intersections of electron correlation, topology, and unconventional superconductivity. The bulk electronic structure of FTS is predicted to be topologically nontrivial thanks to the band inversion between the $d_{xz}$ and $p_z$ bands along $Γ$-$Z$. However, there remain debates in both the authenticity of the Dirac surface states (DSS) and the experimental deviations of band structure from the theoretical band inversion picture. Here we resolve these debates through a comprehensive ARPES investigation. We first observe a persistent DSS independent of $k_z$. Then, by comparing FTS with FeSe which has no band inversion along $Γ$-$Z$, we identify the spectral weight fingerprint of both the presence of the $p_z$ band and the inversion between the $d_{xz}$ and $p_z$ bands. Furthermore, we propose a reconciling band structure under the framework of a tight-binding model preserving crystal symmetry. Our results highlight the significant influence of correlation on modifying the band structure and make a strong case for the existence of topological band structure in this unconventional superconductor.
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- 23 August 2023
- Published by arXiv in arXiv
Open Access
Spectroscopic evidence for topological band structure in FeTe$_{0.55}$Se$_{0.45}$
by Y. -F. Li, S. -D. Chen, M. Garcia-Diez, M. I. Iraola, H. Pfau, Y. -L. Zhu, Z. -Q. Mao, T. Chen, M. Yi, P. -C. Dai, et al.
FeTe$_{0.55}$Se$_{0.45}$(FTS) occupies a special spot in modern condensed matter physics at the intersections of electron correlation, topology, and unconventional superconductivity. The bulk electronic structure of FTS is predicted to be topologically nontrivial thanks to the band inversion between the $d_{xz}$ and $p_z$ bands along $Γ$-$Z$. However, there remain debates in both the authenticity of the Dirac surface states (DSS) and the experimental deviations of band structure from the theoretical band inversion picture. Here we resolve these debates through a comprehensive ARPES investigation. We first observe a persistent DSS independent of $k_z$. Then, by comparing FTS with FeSe which has no band inversion along $Γ$-$Z$, we identify the spectral weight fingerprint of both the presence of the $p_z$ band and the inversion between the $d_{xz}$ and $p_z$ bands. Furthermore, we propose a reconciling band structure under the framework of a tight-binding model preserving crystal symmetry. Our results highlight the significant influence of correlation on modifying the band structure and make a strong case for the existence of topological band structure in this unconventional superconductor.
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Cited by 16
- 26 April 2021
- Published by American Physical Society (APS) in Physical Review B
Anisotropic quasiparticle coherence in nematic ${BaFe}_{2} {As}_{2}$ studied with strain-dependent ARPES
by H. Pfau, S. D. Chen, M. Hashimoto, N. Gauthier, C. R. Rotundu, J. C. Palmstrom, I. R. Fisher, S.-K. Mo, Z.-X. Shen, D. Lu
The hallmark of nematic order in iron-based superconductors is a resistivity anisotropy but it is unclear to which extent quasiparticle dispersions, lifetimes, and coherence contribute. While the lifted degeneracy of the Fe $d_{x z}$ and $d_{y z}$ dispersions has been studied extensively, only little is known about the two other factors. Here, we combine in situ strain tuning with ARPES and study the nematic response of the spectral weight in ${BaFe}_{2} {As}_{2}$ . The symmetry analysis of the ARPES spectra demonstrates that the $d_{x z}$ band gains quasiparticle spectral weight compared to the $d_{y z}$ band for negative antisymmetric strain $Δ ε_{y y}$ suggesting the same response inside the nematic phase. Our results are compatible with a different coherence of the $d_{x z}$ and $d_{y z}$ orbital within a Hund's metal picture. We also discuss the influence of orbital mixing.
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- 26 April 2021
- Published by American Physical Society (APS) in Physical Review B
Anisotropic quasiparticle coherence in nematic ${BaFe}_{2} {As}_{2}$ studied with strain-dependent ARPES
by H. Pfau, S. D. Chen, M. Hashimoto, N. Gauthier, C. R. Rotundu, J. C. Palmstrom, I. R. Fisher, S.-K. Mo, Z.-X. Shen, D. Lu
The hallmark of nematic order in iron-based superconductors is a resistivity anisotropy but it is unclear to which extent quasiparticle dispersions, lifetimes, and coherence contribute. While the lifted degeneracy of the Fe $d_{x z}$ and $d_{y z}$ dispersions has been studied extensively, only little is known about the two other factors. Here, we combine in situ strain tuning with ARPES and study the nematic response of the spectral weight in ${BaFe}_{2} {As}_{2}$ . The symmetry analysis of the ARPES spectra demonstrates that the $d_{x z}$ band gains quasiparticle spectral weight compared to the $d_{y z}$ band for negative antisymmetric strain $Δ ε_{y y}$ suggesting the same response inside the nematic phase. Our results are compatible with a different coherence of the $d_{x z}$ and $d_{y z}$ orbital within a Hund's metal picture. We also discuss the influence of orbital mixing.
Cited by 16
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Cited by 145
- 6 December 2019
- Published by American Physical Society (APS) in Physical Review X
Nematic Energy Scale and the Missing Electron Pocket in FeSe
by M. Yi, H. Pfau, Y. Zhang, Y. He, H. Wu, T. Chen, Z. R. Ye, M. Hashimoto, R. Yu, Q. Si, et al.
Superconductivity emerges in proximity to a nematic phase in most iron-based superconductors. It is therefore important to understand the impact of nematicity on the electronic structure. Orbital assignment and tracking across the nematic phase transition prove to be challenging due to the multiband nature of iron-based superconductors and twinning effects. Here, we report a detailed study of the electronic structure of fully detwinned FeSe across the nematic phase transition using angle-resolved photoemission spectroscopy. We clearly observe a nematicity-driven band reconstruction involving $d_{x z}$ , $d_{y z}$ , and $d_{x y}$ orbitals. The nematic energy scale between $d_{x z}$ and $d_{y z}$ bands reaches a maximum of 50 meV at the Brillouin zone corner. We are also able to track the $d_{x z}$ electron pocket across the nematic transition and explain its absence in the nematic state. Our comprehensive data of the electronic structure provide an accurate basis for theoretical models of the superconducting pairing in FeSe.
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- 6 December 2019
- Published by American Physical Society (APS) in Physical Review X
Open Access
Nematic Energy Scale and the Missing Electron Pocket in FeSe
by M. Yi, H. Pfau, Y. Zhang, Y. He, H. Wu, T. Chen, Z. R. Ye, M. Hashimoto, R. Yu, Q. Si, et al.
Superconductivity emerges in proximity to a nematic phase in most iron-based superconductors. It is therefore important to understand the impact of nematicity on the electronic structure. Orbital assignment and tracking across the nematic phase transition prove to be challenging due to the multiband nature of iron-based superconductors and twinning effects. Here, we report a detailed study of the electronic structure of fully detwinned FeSe across the nematic phase transition using angle-resolved photoemission spectroscopy. We clearly observe a nematicity-driven band reconstruction involving $d_{x z}$ , $d_{y z}$ , and $d_{x y}$ orbitals. The nematic energy scale between $d_{x z}$ and $d_{y z}$ bands reaches a maximum of 50 meV at the Brillouin zone corner. We are also able to track the $d_{x z}$ electron pocket across the nematic transition and explain its absence in the nematic state. Our comprehensive data of the electronic structure provide an accurate basis for theoretical models of the superconducting pairing in FeSe.
Cited by 145
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Cited by 117
- 26 September 2016
- Published by American Physical Society (APS) in Physical Review B
Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film
by Y. Zhang, M. Yi, Z.-K. Liu, W. Li, J. J. Lee, R. G. Moore, M. Hashimoto, M. Nakajima, H. Eisaki, S.-K. Mo, et al.
The nematic state, where a system is translationally invariant but breaks rotational symmetry, has drawn great attention recently due to the experimental observations of such a state in both cuprates and iron-based superconductors. The origin of nematicity and its possible tie to the pairing mechanism of high- $T_{c}$ , however, still remain controversial. Here, we study the electronic structure of a multilayer FeSe film using angle-resolved photoemission spectroscopy. The band reconstruction in the nematic state is clearly delineated. We find that the energy splitting between $d_{x z}$ and $d_{y z}$ bands shows a nonmonotonic distribution in momentum space. From the Brillouin zone center to the Brillouin zone corner, the magnitude of splitting first decreases, then increases, and finally reaches the maximum value of $\sim 70$ meV. Moreover, besides the $d_{x z}$ and $d_{y z}$ bands, band splitting was also observed on the $d_{x y}$ bands with a comparable energy scale around 45 meV. Our results suggest that the electronic anisotropy in the nematic state cannot be explained by a simple on-site ferro-orbital order. Instead, strong anisotropy exists in the hopping of all $d_{x z}, d_{y z}$ , and $d_{x y}$ orbitals, the origin of which holds the key to a microscopic understanding of the nematicity in iron-based superconductors.
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- 26 September 2016
- Published by American Physical Society (APS) in Physical Review B
Open Access
Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film
by Y. Zhang, M. Yi, Z.-K. Liu, W. Li, J. J. Lee, R. G. Moore, M. Hashimoto, M. Nakajima, H. Eisaki, S.-K. Mo, et al.
The nematic state, where a system is translationally invariant but breaks rotational symmetry, has drawn great attention recently due to the experimental observations of such a state in both cuprates and iron-based superconductors. The origin of nematicity and its possible tie to the pairing mechanism of high- $T_{c}$ , however, still remain controversial. Here, we study the electronic structure of a multilayer FeSe film using angle-resolved photoemission spectroscopy. The band reconstruction in the nematic state is clearly delineated. We find that the energy splitting between $d_{x z}$ and $d_{y z}$ bands shows a nonmonotonic distribution in momentum space. From the Brillouin zone center to the Brillouin zone corner, the magnitude of splitting first decreases, then increases, and finally reaches the maximum value of $\sim 70$ meV. Moreover, besides the $d_{x z}$ and $d_{y z}$ bands, band splitting was also observed on the $d_{x y}$ bands with a comparable energy scale around 45 meV. Our results suggest that the electronic anisotropy in the nematic state cannot be explained by a simple on-site ferro-orbital order. Instead, strong anisotropy exists in the hopping of all $d_{x z}, d_{y z}$ , and $d_{x y}$ orbitals, the origin of which holds the key to a microscopic understanding of the nematicity in iron-based superconductors.
Cited by 117
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Cited by 282
- 23 July 2015
- Published by Springer Nature in Nature Communications
Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
by M. Yi, Z-K Liu, Y. Zhang, R. Yu, J.-X. Zhu, J.J. Lee, R.G. Moore, F.T. Schmitt, W. Li, S.C. Riggs, et al.
Establishing the appropriate theoretical framework for unconventional superconductivity in the iron-based materials requires correct understanding of both the electron correlation strength and the role of Fermi surfaces. This fundamental issue becomes especially relevant with the discovery of the iron chalcogenide superconductors. Here, we use angle-resolved photoemission spectroscopy to measure three representative iron chalcogenides, FeTe_0.56Se_0.44, monolayer FeSe grown on SrTiO₃ and K_0.76Fe_1.72Se₂. We show that these superconductors are all strongly correlated, with an orbital-selective strong renormalization in the d_xy bands despite having drastically different Fermi surface topologies. Furthermore, raising temperature brings all three compounds from a metallic state to a phase where the d_xy orbital loses all spectral weight while other orbitals remain itinerant. These observations establish that iron chalcogenides display universal orbital-selective strong correlations that are insensitive to the Fermi surface topology, and are close to an orbital-selective Mott phase, hence placing strong constraints for theoretical understanding of iron-based superconductors.
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- 23 July 2015
- Published by Springer Nature in Nature Communications
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Open Access
Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
by M. Yi, Z-K Liu, Y. Zhang, R. Yu, J.-X. Zhu, J.J. Lee, R.G. Moore, F.T. Schmitt, W. Li, S.C. Riggs, et al.
Establishing the appropriate theoretical framework for unconventional superconductivity in the iron-based materials requires correct understanding of both the electron correlation strength and the role of Fermi surfaces. This fundamental issue becomes especially relevant with the discovery of the iron chalcogenide superconductors. Here, we use angle-resolved photoemission spectroscopy to measure three representative iron chalcogenides, FeTe_0.56Se_0.44, monolayer FeSe grown on SrTiO₃ and K_0.76Fe_1.72Se₂. We show that these superconductors are all strongly correlated, with an orbital-selective strong renormalization in the d_xy bands despite having drastically different Fermi surface topologies. Furthermore, raising temperature brings all three compounds from a metallic state to a phase where the d_xy orbital loses all spectral weight while other orbitals remain itinerant. These observations establish that iron chalcogenides display universal orbital-selective strong correlations that are insensitive to the Fermi surface topology, and are close to an orbital-selective Mott phase, hence placing strong constraints for theoretical understanding of iron-based superconductors.
Cited by 282
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- 5 March 2015
- Published by arXiv in arXiv
Distinctive momentum dependence of the band reconstruction in the nematic state of FeSe thin film
by Y. Zhang, M. Yi, Z. -K. Liu, W. Li, J. J. Lee, R. G. Moore, M. Hashimoto, N. Masamichi, H. Eisaki, S. -K. Mo, et al.
Nematic state, where the system is translationally invariant but breaks the rotational symmetry, has drawn great attentions recently due to experimental observations of such a state in both cuprates and iron-based superconductors. The mechanism of nematicity that is likely tied to the pairing mechanism of high-Tc, however, still remains controversial. Here, we studied the electronic structure of multilayer FeSe film by angle-resolved photoemission spectroscopy (ARPES). We found that the FeSe film enters the nematic state around 125 K, while the electronic signature of long range magnetic order has not been observed down to 20K indicating the non-magnetic origin of the nematicity. The band reconstruction in the nematic state is characterized by the splitting of the dxz and dyz bands. More intriguingly, such energy splitting is strong momentum dependent with the largest band splitting of ~80meV at the zone corner. The simple on-site ferro-orbital ordering is insufficient to reproduce the nontrivial momentum dependence of the band reconstruction. Instead, our results suggest that the nearest-neighbor hopping of dxz and dyz is highly anisotropic in the nematic state, the origin of which holds the key in understanding the nematicity in iron-based superconductors.
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- 5 March 2015
- Published by arXiv in arXiv
Open Access
Distinctive momentum dependence of the band reconstruction in the nematic state of FeSe thin film
by Y. Zhang, M. Yi, Z. -K. Liu, W. Li, J. J. Lee, R. G. Moore, M. Hashimoto, N. Masamichi, H. Eisaki, S. -K. Mo, et al.
Nematic state, where the system is translationally invariant but breaks the rotational symmetry, has drawn great attentions recently due to experimental observations of such a state in both cuprates and iron-based superconductors. The mechanism of nematicity that is likely tied to the pairing mechanism of high-Tc, however, still remains controversial. Here, we studied the electronic structure of multilayer FeSe film by angle-resolved photoemission spectroscopy (ARPES). We found that the FeSe film enters the nematic state around 125 K, while the electronic signature of long range magnetic order has not been observed down to 20K indicating the non-magnetic origin of the nematicity. The band reconstruction in the nematic state is characterized by the splitting of the dxz and dyz bands. More intriguingly, such energy splitting is strong momentum dependent with the largest band splitting of ~80meV at the zone corner. The simple on-site ferro-orbital ordering is insufficient to reproduce the nontrivial momentum dependence of the band reconstruction. Instead, our results suggest that the nearest-neighbor hopping of dxz and dyz is highly anisotropic in the nematic state, the origin of which holds the key in understanding the nematicity in iron-based superconductors.
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Cited by 64
- 25 April 2014
- Published by Springer Nature in Nature Communications
Dynamic competition between spin-density wave order and superconductivity in underdoped Ba1−xKxFe2As2
by M. Yi, Y. Zhang, Z.-K. Liu, X. Ding, J.-H. Chu, A.F. Kemper, N. Plonka, B. Moritz, M. Hashimoto, S.-K. Mo, et al.
An intriguing aspect of unconventional superconductivity is that it always appears in the vicinity of other competing phases, whose suppression brings the full emergence of superconductivity. In the iron pnictides, these competing phases are marked by a tetragonal-to-orthorhombic structural transition and a collinear spin-density wave (SDW) transition. There has been macroscopic evidence for competition between these phases and superconductivity as the magnitude of both the orthorhombicity and magnetic moment are suppressed in the superconducting state. Here, using angle-resolved photoemission spectroscopy on detwinned underdoped Ba_1−xK_xFe₂As₂, we observe a coexistence of both the SDW gap and superconducting gap in the same electronic structure. Furthermore, our data reveal that following the onset of superconductivity, the SDW gap decreases in magnitude and shifts in a direction consistent with a reduction of the orbital anisotropy. This observation provides direct spectroscopic evidence for the dynamic competition between superconductivity and both SDW and electronic nematic orders in these materials.
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- 25 April 2014
- Published by Springer Nature in Nature Communications
Open Access
Dynamic competition between spin-density wave order and superconductivity in underdoped Ba1−xKxFe2As2
by M. Yi, Y. Zhang, Z.-K. Liu, X. Ding, J.-H. Chu, A.F. Kemper, N. Plonka, B. Moritz, M. Hashimoto, S.-K. Mo, et al.
An intriguing aspect of unconventional superconductivity is that it always appears in the vicinity of other competing phases, whose suppression brings the full emergence of superconductivity. In the iron pnictides, these competing phases are marked by a tetragonal-to-orthorhombic structural transition and a collinear spin-density wave (SDW) transition. There has been macroscopic evidence for competition between these phases and superconductivity as the magnitude of both the orthorhombicity and magnetic moment are suppressed in the superconducting state. Here, using angle-resolved photoemission spectroscopy on detwinned underdoped Ba_1−xK_xFe₂As₂, we observe a coexistence of both the SDW gap and superconducting gap in the same electronic structure. Furthermore, our data reveal that following the onset of superconductivity, the SDW gap decreases in magnitude and shifts in a direction consistent with a reduction of the orbital anisotropy. This observation provides direct spectroscopic evidence for the dynamic competition between superconductivity and both SDW and electronic nematic orders in these materials.
Cited by 64
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Cited by 46
- 3 September 2013
- Published by American Physical Society (APS) in Physical Review B
Absence of superconductivity in the hole-doped Fe pnictide Ba(Fe $_{1 - x}$ Mn $_{x}$ ) $_{2}$ As $_{2}$ : Photoemission and x-ray absorption spectroscopy studies
by H. Suzuki, T. Yoshida, S. Ideta, G. Shibata, K. Ishigami, T. Kadono, A. Fujimori, M. Hashimoto, D. H. Lu, Z.-X. Shen, et al.
We have studied the electronic structure of Ba(Fe $_{1 - x}$ Mn $_{x}$ ) $_{2}$ As $_{2}$ ( $x = 0.08$ ), which fails to become a superconductor in spite of the formal hole doping like Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ , with photoemission spectroscopy and x-ray absorption spectroscopy (XAS). With decreasing temperature, a transition from the paramagnetic phase to the antiferromagnetic phase was clearly observed by angle-resolved photoemission spectroscopy. XAS results indicated that the substituted Mn atoms form a strongly hybridized ground state. Resonance-photoemission spectra at the Mn $L_{3}$ edge revealed that the Mn $3 d$ partial density of states is distributed over a wide energy range of 2–13 eV below the Fermi level ( $E_{F}$ ), with little contribution around $E_{F}$ . This indicates that the dopant Mn 3 $d$ states are localized in spite of the strong Mn $3 d$ –As $4 p$ hybridization and split into the occupied and unoccupied parts due to the on-site Coulomb and exchange interaction. The absence of superconductivity in Ba(Fe $_{1 - x}$ Mn $_{x}$ ) $_{2}$ As $_{2}$ can thus be ascribed both to the absence of carrier doping in the FeAs plane and to the stabilization of the competing G-type antiferromagnetic order by the Mn impurities.
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- 3 September 2013
- Published by American Physical Society (APS) in Physical Review B
Absence of superconductivity in the hole-doped Fe pnictide Ba(Fe $_{1 - x}$ Mn $_{x}$ ) $_{2}$ As $_{2}$ : Photoemission and x-ray absorption spectroscopy studies
by H. Suzuki, T. Yoshida, S. Ideta, G. Shibata, K. Ishigami, T. Kadono, A. Fujimori, M. Hashimoto, D. H. Lu, Z.-X. Shen, et al.
We have studied the electronic structure of Ba(Fe $_{1 - x}$ Mn $_{x}$ ) $_{2}$ As $_{2}$ ( $x = 0.08$ ), which fails to become a superconductor in spite of the formal hole doping like Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ , with photoemission spectroscopy and x-ray absorption spectroscopy (XAS). With decreasing temperature, a transition from the paramagnetic phase to the antiferromagnetic phase was clearly observed by angle-resolved photoemission spectroscopy. XAS results indicated that the substituted Mn atoms form a strongly hybridized ground state. Resonance-photoemission spectra at the Mn $L_{3}$ edge revealed that the Mn $3 d$ partial density of states is distributed over a wide energy range of 2–13 eV below the Fermi level ( $E_{F}$ ), with little contribution around $E_{F}$ . This indicates that the dopant Mn 3 $d$ states are localized in spite of the strong Mn $3 d$ –As $4 p$ hybridization and split into the occupied and unoccupied parts due to the on-site Coulomb and exchange interaction. The absence of superconductivity in Ba(Fe $_{1 - x}$ Mn $_{x}$ ) $_{2}$ As $_{2}$ can thus be ascribed both to the absence of carrier doping in the FeAs plane and to the stabilization of the competing G-type antiferromagnetic order by the Mn impurities.
Cited by 46
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Cited by 1
- 17 June 2011
- Published by American Physical Society (APS) in Physical Review B
Publisher’s Note: High-energy anomaly in Nd2−xCexCuO4investigated by angle-resolved photoemission spectroscopy and quantum Monte Carlo simulations [Phys. Rev. B83, 195123 (2011)]
by F. Schmitt, B. Moritz, S. Johnston, S.-K. Mo, M. Hashimoto, R. G. Moore, D.-H. Lu, E. Motoyama, M. Greven, T. P. Devereaux, et al.
DOI:https://doi.org/10.1103/PhysRevB.83.239905
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- 17 June 2011
- Published by American Physical Society (APS) in Physical Review B
Publisher’s Note: High-energy anomaly in Nd2−xCexCuO4investigated by angle-resolved photoemission spectroscopy and quantum Monte Carlo simulations [Phys. Rev. B83, 195123 (2011)]
by F. Schmitt, B. Moritz, S. Johnston, S.-K. Mo, M. Hashimoto, R. G. Moore, D.-H. Lu, E. Motoyama, M. Greven, T. P. Devereaux, et al.
DOI:https://doi.org/10.1103/PhysRevB.83.239905
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