Magnetic impurities in Kondo insulators: An application to samarium hexaboride

Fuhrman, W. T.; Nikolić, P.

doi:10.1103/physrevb.101.245118

Magnetic impurities in Kondo insulators: An application to samarium hexaboride

Journal Article · Wed Jun 03 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.101.245118· OSTI ID:1775124

Fuhrman, W. T. ^[1]; ^[2]

Johns Hopkins Univ., Baltimore, MD (United States); Johns Hopkins University
Johns Hopkins Univ., Baltimore, MD (United States); George Mason Univ., Fairfax, VA (United States)

Impurities and defects in Kondo insulators can have an unusual impact on dynamics that blends with effects of intrinsic electron correlations. Such crystal imperfections are difficult to avoid, and their consequences are incompletely understood. In this work, we study magnetic impurities in Kondo insulators via perturbation theory of the s-d Kondo impurity model adapted to small-band-gap insulators. The calculated magnetization and specific heat agree with recent thermodynamic measurements in samarium hexaboride (SmB₆). This qualitative agreement supports the physical picture of multichannel Kondo screening of local moments by electrons and holes involving both intrinsic and impurity bands. Specific heat is thermally activated in zero field by Kondo screening through subgap impurity bands and exhibits a characteristic upturn as the temperature is decreased. In contrast, magnetization obtains a dominant quantum correction from partial screening by virtual particle-hole pairs in intrinsic bands. We point out that magnetic impurities could impact de Haas–van Alphen quantum oscillations in SmB6, through the effects of Landau quantization in intrinsic bands on the Kondo screening of impurity moments.

View Accepted Manuscript (DOE)

Research Organization:: Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019331; FG02-08ER46544

OSTI ID:: 1775124

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 24 Vol. 101; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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