Screened moments and extrinsic in-gap states in samarium hexaboride

Fuhrman, W. T.; Chamorro, J. R.; Alekseev, P. A.; Mignot, J. -M.; Keller, T.; Rodriguez-Rivera, J. A.; Qiu, Y.; Nikolić, P.; McQueen, T. M.; Broholm, C. L.

doi:10.1038/s41467-018-04007-z

Screened moments and extrinsic in-gap states in samarium hexaboride

Journal Article · Wed Apr 18 00:00:00 EDT 2018 · Nature Communications

DOI:https://doi.org/10.1038/s41467-018-04007-z· OSTI ID:1529934

^[1]; Chamorro, J. R. ^[2]; Alekseev, P. A. ^[3]; ^[4]; ^[5]; Rodriguez-Rivera, J. A. ^[6]; Qiu, Y. ^[7]; Nikolić, P. ^[8]; McQueen, T. M. ^[9]; Broholm, C. L. ^[9]

Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter and Dept. of Physics; None
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter, Dept. of Physics and Astronomy and Dept. of Chemistry
National Research Centre (NRC), Moscow (Russian Federation). Kurchatov Inst. (NRCKI); National Research Nuclear Univ. (MEPhi), Moscow (Russian Federation)
Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA-Saclay), Gif-sur-Yvette (France)
Max Planck-Inst. für Festkörperforschung, Stuttgart (Germany); Max Planck Society at the Forschungsneutronenquelle Heinz Maier-Leibnitz, Garching (Germany)
Univ. of Maryland, College Park, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Johns Hopkins Univ., Baltimore, MD (United States); George Mason Univ., Fairfax, VA (United States)
Johns Hopkins Univ., Baltimore, MD (United States)

Samarium hexaboride (SmB₆) is a Kondo insulator, with a narrow gap due to hybridization between localized and conduction electrons. Despite being an insulator, many samples show metal-like properties. Rare-earth purification is exceedingly difficult, and nominally pure samples may contain 2% or more of impurities. Here to determine the effects of rare-earth doping on SmB6, we synthesized and probed a series of gadolinium-doped samples. We found a relationship between specific heat and impurity moment screening which scales systematically. Consistent with this finding, our neutron scattering experiments of a high purity sample of doubly isotopic ¹⁵⁴Sm¹¹B₆ show no intrinsic excitations below the well-established 13 meV spin-exciton. The result of introducing impurities into a Kondo insulator is incompletely understood, but it is clear from our measurements that there is a systematic relationship between rare-earth impurities and metal-like properties in SmB₆.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: FG02-08ER46544

OSTI ID:: 1529934

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Resonant inelastic x-ray scattering investigation of the crystal-field splitting of Sm 3 + in SmB 6 Amorese, Andrea; Stockert, Oliver; Kummer, Kurt Physical Review B, Vol. 100, Issue 24 https://doi.org/10.1103/physrevb.100.241107	journal	December 2019
Field-dependent heat transport in the Kondo insulator SmB 6 : Phonons scattered by magnetic impurities Boulanger, M-E.; Laliberté, F.; Dion, M. Physical Review B, Vol. 97, Issue 24 https://doi.org/10.1103/physrevb.97.245141	journal	June 2018
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