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Title: Magnetic dichroism in the Kondo insulator SmB 6

Abstract

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.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8]
  1. 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
  2. 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
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
  4. Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics; Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
  5. Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy
  6. Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy. Dept. of Chemistry
  7. 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
  8. 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
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Johns Hopkins Univ., Baltimore, MD (United States); Northern Illinois Univ., DeKalb, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1505147
Alternate Identifier(s):
OSTI ID: 1490145
Grant/Contract Number:  
AC02-06CH11357; FG02-08ER46544; FG02-03ER46097
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
Kondo insulators; topological insulators; X-ray magnetic circular dichroism

Citation Formats

Fuhrman, W. T., Leiner, J. C., Freeland, J. W., van Veenendaal, M., Koohpayeh, S. M., Phelan, W. Adam, McQueen, T. M., and Broholm, C. Magnetic dichroism in the Kondo insulator SmB6. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.020401.
Fuhrman, W. T., Leiner, J. C., Freeland, J. W., van Veenendaal, M., Koohpayeh, S. M., Phelan, W. Adam, McQueen, T. M., & Broholm, C. Magnetic dichroism in the Kondo insulator SmB6. United States. doi:10.1103/PhysRevB.99.020401.
Fuhrman, W. T., Leiner, J. C., Freeland, J. W., van Veenendaal, M., Koohpayeh, S. M., Phelan, W. Adam, McQueen, T. M., and Broholm, C. Wed . "Magnetic dichroism in the Kondo insulator SmB6". United States. doi:10.1103/PhysRevB.99.020401.
@article{osti_1505147,
title = {Magnetic dichroism in the Kondo insulator SmB6},
author = {Fuhrman, W. T. and Leiner, J. C. and Freeland, J. W. and van Veenendaal, M. and Koohpayeh, S. M. and Phelan, W. Adam and McQueen, T. M. and Broholm, C.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.99.020401},
journal = {Physical Review B},
issn = {2469-9950},
number = 2,
volume = 99,
place = {United States},
year = {2019},
month = {1}
}

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Works referenced in this record:

Topological Insulators in Three Dimensions
journal, March 2007