Critical role of magnetic moments in heavy-fermion materials: Revisiting mysteries of SmB6
Abstract
Heavy-fermion family exhibits fascinating and often puzzling properties due to the presence of open-shell f ions and the complexity of the associated charge, orbital, and spin degrees of freedom. SmB6 is a prototypical heavy-fermion compound that is electrically insulating but yet it displays quantum oscillations, which are a telltale signature of the metallic state. Adding to the enigma is the possibility that SmB6 is a topological Kondo insulator. Here, by treating the spin degree of freedom on an equal footing with other degrees of freedom using the parameter-free strongly-constrained and appropriately-normed (SCAN) density functional, we explore the ground-state electronic structure of SmB6. A number of competing magnetic phases lying very closely in energy are found, indicating the key role of spin fluctuations in the material. The computed band structure, crystal-field splittings in the f-electron complex, the heavy effective electron mass at the Fermi energy, and the large specific heat are all in good agreement with the corresponding experimental results. In particular, our predicted FS explains the experimentally observed bulk quantum oscillations as well as the low electrical conductivity of SmB6. The topological Kondo state of SmB6 is shown to be robust regardless of its magnetic configuration. The excellent performance ofmore »
- Authors:
-
- Tulane Univ., New Orleans, LA (United States)
- Tata Inst. of Fundamental Research, Mumbai (India)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Lappeenranta University of Technology (Finland); Northeastern Univ., Boston, MA (United States)
- Northeastern Univ., Boston, MA (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC). Basic Energy Sciences (BES)
- OSTI Identifier:
- 1871473
- Report Number(s):
- LA-UR-20-21925
Journal ID: ISSN 2469-9950; TRN: US2307085
- Grant/Contract Number:
- 89233218CNA000001; SC0012575
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 105; Journal Issue: 19; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Zhang, Ruiqi, Singh, Bahadur, Lane, Christopher, Kidd, Jamin, Zhang, Yubo, Barbiellini, Bernardo, Markiewicz, Robert S., Bansil, Arun, and Sun, Jianwei. Critical role of magnetic moments in heavy-fermion materials: Revisiting mysteries of SmB6. United States: N. p., 2022.
Web. doi:10.1103/physrevb.105.195134.
Zhang, Ruiqi, Singh, Bahadur, Lane, Christopher, Kidd, Jamin, Zhang, Yubo, Barbiellini, Bernardo, Markiewicz, Robert S., Bansil, Arun, & Sun, Jianwei. Critical role of magnetic moments in heavy-fermion materials: Revisiting mysteries of SmB6. United States. https://doi.org/10.1103/physrevb.105.195134
Zhang, Ruiqi, Singh, Bahadur, Lane, Christopher, Kidd, Jamin, Zhang, Yubo, Barbiellini, Bernardo, Markiewicz, Robert S., Bansil, Arun, and Sun, Jianwei. Mon .
"Critical role of magnetic moments in heavy-fermion materials: Revisiting mysteries of SmB6". United States. https://doi.org/10.1103/physrevb.105.195134. https://www.osti.gov/servlets/purl/1871473.
@article{osti_1871473,
title = {Critical role of magnetic moments in heavy-fermion materials: Revisiting mysteries of SmB6},
author = {Zhang, Ruiqi and Singh, Bahadur and Lane, Christopher and Kidd, Jamin and Zhang, Yubo and Barbiellini, Bernardo and Markiewicz, Robert S. and Bansil, Arun and Sun, Jianwei},
abstractNote = {Heavy-fermion family exhibits fascinating and often puzzling properties due to the presence of open-shell f ions and the complexity of the associated charge, orbital, and spin degrees of freedom. SmB6 is a prototypical heavy-fermion compound that is electrically insulating but yet it displays quantum oscillations, which are a telltale signature of the metallic state. Adding to the enigma is the possibility that SmB6 is a topological Kondo insulator. Here, by treating the spin degree of freedom on an equal footing with other degrees of freedom using the parameter-free strongly-constrained and appropriately-normed (SCAN) density functional, we explore the ground-state electronic structure of SmB6. A number of competing magnetic phases lying very closely in energy are found, indicating the key role of spin fluctuations in the material. The computed band structure, crystal-field splittings in the f-electron complex, the heavy effective electron mass at the Fermi energy, and the large specific heat are all in good agreement with the corresponding experimental results. In particular, our predicted FS explains the experimentally observed bulk quantum oscillations as well as the low electrical conductivity of SmB6. The topological Kondo state of SmB6 is shown to be robust regardless of its magnetic configuration. The excellent performance of SCAN in heavy-fermion systems is explained in terms of its ability to treat self-interaction errors and symmetry breaking within the framework of the density functional theory. Our study provides a new approach for modeling heavy-fermion materials},
doi = {10.1103/physrevb.105.195134},
journal = {Physical Review. B},
number = 19,
volume = 105,
place = {United States},
year = {Mon May 23 00:00:00 EDT 2022},
month = {Mon May 23 00:00:00 EDT 2022}
}
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