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Li H, Wang G, Ding N, Ren Q, Zhao G, Lin W, Yang J, Yan W, Li Q, Yang R, Yuan S, Denlinger JD, Wang Z, Zhang X, Wray LA, Dong S, Qian D, Miao L. Spectroscopic evidence of spin-state excitation in d-electron correlated semiconductor FeSb 2. Proc Natl Acad Sci U S A 2024; 121:e2321193121. [PMID: 38954549 PMCID: PMC11252798 DOI: 10.1073/pnas.2321193121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 05/28/2024] [Indexed: 07/04/2024] Open
Abstract
Iron antimonide (FeSb2) has been investigated for decades due to its puzzling electronic properties. It undergoes the temperature-controlled transition from an insulator to an ill-defined metal, with a cross-over from diamagnetism to paramagnetism. Extensive efforts have been made to uncover the underlying mechanism, but a consensus has yet to be reached. While macroscopic transport and magnetic measurements can be explained by different theoretical proposals, the essential spectroscopic evidence required to distinguish the physical origin is missing. In this paper, through the use of X-ray absorption spectroscopy and atomic multiplet simulations, we have observed the mixed spin states of 3d 6 configuration in FeSb2. Furthermore, we reveal that the enhancement of the conductivity, whether induced by temperature or doping, is characterized by populating the high-spin state from the low-spin state. Our work constitutes vital spectroscopic evidence that the electrical/magnetical transition in FeSb2 is directly associated with the spin-state excitation.
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Affiliation(s)
- Huayao Li
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing211189, China
| | - Guohua Wang
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai200240, China
| | - Ning Ding
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing211189, China
| | - Quan Ren
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing211189, China
| | - Gan Zhao
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing211189, China
| | - Wenting Lin
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing211189, China
| | - Jinchuan Yang
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai200240, China
| | - Wensheng Yan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230029, China
| | - Qian Li
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230029, China
| | - Run Yang
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing211189, China
| | - Shijun Yuan
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing211189, China
| | | | - Zhenxing Wang
- Wuhan National High Magnetic Field Center & School of Physics, Huazhong University of Science and Technology, Wuhan430074, China
| | - Xiaoqian Zhang
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing211189, China
| | - L. Andrew Wray
- Department of Physics, New York University, New York, NY10003
| | - Shuai Dong
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing211189, China
| | - Dong Qian
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai200240, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing210093, China
- Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai200240, China
| | - Lin Miao
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing211189, China
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Breakdown of the scaling relation of anomalous Hall effect in Kondo lattice ferromagnet USbTe. Nat Commun 2023; 14:527. [PMID: 36720874 PMCID: PMC9889341 DOI: 10.1038/s41467-023-36221-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 01/18/2023] [Indexed: 02/02/2023] Open
Abstract
The interaction between strong correlation and Berry curvature is an open territory of in the field of quantum materials. Here we report large anomalous Hall conductivity in a Kondo lattice ferromagnet USbTe which is dominated by intrinsic Berry curvature at low temperatures. However, the Berry curvature induced anomalous Hall effect does not follow the scaling relation derived from Fermi liquid theory. The onset of the Berry curvature contribution coincides with the Kondo coherent temperature. Combined with ARPES measurement and DMFT calculations, this strongly indicates that Berry curvature is hosted by the flat bands induced by Kondo hybridization at the Fermi level. Our results demonstrate that the Kondo coherence of the flat bands has a dramatic influence on the low temperature physical properties associated with the Berry curvature, calling for new theories of scaling relations of anomalous Hall effect to account for the interaction between strong correlation and Berry curvature.
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Giannakis I, Leshen J, Kavai M, Ran S, Kang CJ, Saha SR, Zhao Y, Xu Z, Lynn JW, Miao L, Wray LA, Kotliar G, Butch NP, Aynajian P. Orbital-selective Kondo lattice and enigmatic f electrons emerging from inside the antiferromagnetic phase of a heavy fermion. SCIENCE ADVANCES 2019; 5:eaaw9061. [PMID: 31667341 PMCID: PMC6799987 DOI: 10.1126/sciadv.aaw9061] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 09/25/2019] [Indexed: 05/25/2023]
Abstract
Novel electronic phenomena frequently form in heavy-fermions because of the mutual localized and itinerant nature of f-electrons. On the magnetically ordered side of the heavy-fermion phase diagram, f-moments are expected to be localized and decoupled from the Fermi surface. It remains ambiguous whether Kondo lattice can develop inside the magnetically ordered phase. Using spectroscopic imaging with scanning tunneling microscope, complemented by neutron scattering, x-ray absorption spectroscopy, and dynamical mean field theory, we probe the electronic states in antiferromagnetic USb2. We visualize a large gap in the antiferromagnetic phase within which Kondo hybridization develops below ~80 K. Our calculations indicate the antiferromagnetism and Kondo lattice to reside predominantly on different f-orbitals, promoting orbital selectivity as a new conception into how these phenomena coexist in heavy-fermions. Finally, at 45 K, we find a novel first order-like transition through abrupt emergence of nontrivial 5f-electronic states that may resemble the "hidden-order" phase of URu2Si2.
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Affiliation(s)
- Ioannis Giannakis
- Department of Physics, Applied Physics, and Astronomy, Binghamton University, Binghamton, NY 13902, USA
| | - Justin Leshen
- Department of Physics, Applied Physics, and Astronomy, Binghamton University, Binghamton, NY 13902, USA
| | - Mariam Kavai
- Department of Physics, Applied Physics, and Astronomy, Binghamton University, Binghamton, NY 13902, USA
| | - Sheng Ran
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742, USA
| | - Chang-Jong Kang
- Department of Physics and Astronomy, Rutgers University, NJ 08854, USA
| | - Shanta R. Saha
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742, USA
| | - Y. Zhao
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
| | - Z. Xu
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - J. W. Lynn
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Lin Miao
- Department of Physics, New York University, New York, NY 10003, USA
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - L. Andrew Wray
- Department of Physics, New York University, New York, NY 10003, USA
| | - Gabriel Kotliar
- Department of Physics and Astronomy, Rutgers University, NJ 08854, USA
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Nicholas P. Butch
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742, USA
| | - Pegor Aynajian
- Department of Physics, Applied Physics, and Astronomy, Binghamton University, Binghamton, NY 13902, USA
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