Magnetic dichroism in the Kondo insulator
- Univ. of Maryland, College Park, MD (United States). Center for Nanophysics and Advanced Materials. Dept. of Physics; Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy
- Inst. for Basic Science (IBS), Seoul (Korea, Republic of). Center for Correlated Electron Systems; Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
- Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics; Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
- Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy
- Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy. Dept. of Chemistry
- Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy. Dept. of Chemistry. Dept. of Materials Science and Engineering
- Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy. Dept. of Materials Science and Engineering; National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
Samarium hexaboride ($${\mathrm{SmB}}_{6}$$) is a purported topological Kondo insulator, with theory predicting that the experimentally observed metallic surface states manifest from a topologically nontrivial insulating bulk band structure. The insulating bulk itself is driven by strong correlations, and both bulk and surface are known to host compelling magnetic and electronic phenomena. We employed here x-ray absorption spectroscopy and x-ray magnetic circular dichroism at the Sm $${M}_{4,5}$$ edges to probe the surface and bulk magnetic properties of $${\mathrm{Sm}}^{2+}$$ and $${\mathrm{Sm}}^{3+}$$ within $${\mathrm{SmB}}_{6}$$. We observed an unexpected antialignment to the applied field of the $${\mathrm{Sm}}^{3+}$$ magnetic dipole moment below $T=75$ K and of the total orbital moment of samarium below 30 K. The total bulk magnetization at 2 K is, however, positive and driven by $${\mathrm{Sm}}^{2+}$$ Van Vleck susceptibility as well as 1% paramagnetic impurities with $${{\mu}}_{\mathrm{eff}}=5.2(1){{\mu}}_{\mathrm{B}}$$. This indicates the diamagneticlike $${\mathrm{Sm}}^{3+}$$ magnetism is only a portion of the net magnetization, partially offsetting the response of paramagnetic impurities known within the bulk.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States); Johns Hopkins Univ., Baltimore, MD (United States); Northern Illinois Univ., DeKalb, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357; FG02-08ER46544; FG02-03ER46097
- OSTI ID:
- 1505147
- Alternate ID(s):
- OSTI ID: 1490145
- Journal Information:
- Physical Review B, Vol. 99, Issue 2; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Valence transition in topological Kondo insulator
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journal | October 2019 |
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