Intrinsic Low-Temperature Magnetism in SmB_{6}
By means of new muon spin relaxation experiments, we disentangle extrinsic and intrinsic sources of low-temperature bulk magnetism in the candidate topological Kondo insulator (TKI) SmB_{6}. Results on Al-flux-grown SmB_{6} single crystals are compared to those on a large floating-zone-grown ^{154}Sm ^{11}B_{6} single crystal in which a 14 meV bulk spin exciton has been detected by inelastic neutron scattering. Below ∼10 K, we detect the gradual development of quasistatic magnetism due to rare-earth impurities and Sm vacancies. Our measurements also reveal two additional forms of intrinsic magnetism: (1) underlying low-energy (∼100 meV) weak magnetic moment (∼10^{-2} μ_{B}) fluctuations similar to those detected in the related candidate TKI YbB_{12} that persist down to millikelvin temperatures, and (2) magnetic fluctuations consistent with a 2.6 meV bulk magnetic excitation at zero magnetic field that appears to hinder surface conductivity above ∼4.5 K. We discuss potential origins of the magnetism.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2019 |
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| Erschienen: |
2019 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:123 |
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| Enthalten in: |
Physical review letters - 123(2019), 19 vom: 08. Nov., Seite 197203 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Gheidi, S [VerfasserIn] |
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| Anmerkungen: |
Date Completed 26.11.2019 Date Revised 08.01.2020 published: Print Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1103/PhysRevLett.123.197203 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM303675926 |
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| 500 | |a Date Revised 08.01.2020 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a By means of new muon spin relaxation experiments, we disentangle extrinsic and intrinsic sources of low-temperature bulk magnetism in the candidate topological Kondo insulator (TKI) SmB_{6}. Results on Al-flux-grown SmB_{6} single crystals are compared to those on a large floating-zone-grown ^{154}Sm ^{11}B_{6} single crystal in which a 14 meV bulk spin exciton has been detected by inelastic neutron scattering. Below ∼10 K, we detect the gradual development of quasistatic magnetism due to rare-earth impurities and Sm vacancies. Our measurements also reveal two additional forms of intrinsic magnetism: (1) underlying low-energy (∼100 meV) weak magnetic moment (∼10^{-2} μ_{B}) fluctuations similar to those detected in the related candidate TKI YbB_{12} that persist down to millikelvin temperatures, and (2) magnetic fluctuations consistent with a 2.6 meV bulk magnetic excitation at zero magnetic field that appears to hinder surface conductivity above ∼4.5 K. We discuss potential origins of the magnetism | ||
| 650 | 4 | |a Journal Article | |
| 700 | 1 | |a Akintola, K |e verfasserin |4 aut | |
| 700 | 1 | |a Akella, K S |e verfasserin |4 aut | |
| 700 | 1 | |a Côté, A M |e verfasserin |4 aut | |
| 700 | 1 | |a Dunsiger, S R |e verfasserin |4 aut | |
| 700 | 1 | |a Broholm, C |e verfasserin |4 aut | |
| 700 | 1 | |a Fuhrman, W T |e verfasserin |4 aut | |
| 700 | 1 | |a Saha, S R |e verfasserin |4 aut | |
| 700 | 1 | |a Paglione, J |e verfasserin |4 aut | |
| 700 | 1 | |a Sonier, J E |e verfasserin |4 aut | |
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