Magnetic dichroism in the Kondo insulator SmB6

W. T. Fuhrman; J. C. Leiner; J. W. Freeland; M. Van Veenendaal; S. M. Koohpayeh; W. Adam Phelan; T. M. McQueen; C. Broholm

doi:10.1103/PhysRevB.99.020401

Magnetic dichroism in the Kondo insulator SmB6

W. T. Fuhrman, J. C. Leiner, J. W. Freeland, M. Van Veenendaal, S. M. Koohpayeh, W. Adam Phelan, T. M. McQueen, C. Broholm

Neutron Optics & Polarization

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Samarium hexaboride (SmB6) 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 x-ray absorption spectroscopy and x-ray magnetic circular dichroism at the Sm M4,5 edges to probe the surface and bulk magnetic properties of Sm2+ and Sm3+ within SmB6. We observed an unexpected antialignment to the applied field of the Sm3+ 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 Sm2+ Van Vleck susceptibility as well as 1% paramagnetic impurities with μeff=5.2(1)μB. This indicates the diamagneticlike Sm3+ magnetism is only a portion of the net magnetization, partially offsetting the response of paramagnetic impurities known within the bulk.

Original language	English
Article number	020401
Journal	Physical Review B
Volume	99
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.99.020401
State	Published - Jan 9 2019

Funding

This project was supported by UT-Battelle LDRD 3211-2440. The work at IQM was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Material Sciences and Engineering under Grant No. DE-FG02-08ER46544. W.T.F. is grateful to the ARCS foundation and the Schmidt Science Fellows program, in partnership with the Rhodes Trust, for the partial support of this work. M.v.V. was supported by the U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award No. DE-FG02-03ER46097. Work at Argonne National Laboratory was supported by the U. S. DOE, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.

Funders	Funder number
U. S. DOE
U.S. Department of Energy
Office of Science	DE-AC02-06CH11357
Basic Energy Sciences
Argonne National Laboratory
Achievement Rewards for College Scientists Foundation
Division of Materials Sciences and Engineering	DE-FG02-08ER46544, DE-FG02-03ER46097
UT-Battelle	LDRD 3211-2440
Rhodes Scholarships

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10.1103/PhysRevB.99.020401

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title = "Magnetic dichroism in the Kondo insulator SmB6",

abstract = "Samarium hexaboride (SmB6) 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 x-ray absorption spectroscopy and x-ray magnetic circular dichroism at the Sm M4,5 edges to probe the surface and bulk magnetic properties of Sm2+ and Sm3+ within SmB6. We observed an unexpected antialignment to the applied field of the Sm3+ 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 Sm2+ Van Vleck susceptibility as well as 1% paramagnetic impurities with μeff=5.2(1)μB. This indicates the diamagneticlike Sm3+ magnetism is only a portion of the net magnetization, partially offsetting the response of paramagnetic impurities known within the bulk.",

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AU - Leiner, J. C.

AU - Freeland, J. W.

AU - Van Veenendaal, M.

AU - Koohpayeh, S. M.

AU - Phelan, W. Adam

AU - McQueen, T. M.

AU - Broholm, C.

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N2 - Samarium hexaboride (SmB6) 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 x-ray absorption spectroscopy and x-ray magnetic circular dichroism at the Sm M4,5 edges to probe the surface and bulk magnetic properties of Sm2+ and Sm3+ within SmB6. We observed an unexpected antialignment to the applied field of the Sm3+ 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 Sm2+ Van Vleck susceptibility as well as 1% paramagnetic impurities with μeff=5.2(1)μB. This indicates the diamagneticlike Sm3+ magnetism is only a portion of the net magnetization, partially offsetting the response of paramagnetic impurities known within the bulk.

AB - Samarium hexaboride (SmB6) 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 x-ray absorption spectroscopy and x-ray magnetic circular dichroism at the Sm M4,5 edges to probe the surface and bulk magnetic properties of Sm2+ and Sm3+ within SmB6. We observed an unexpected antialignment to the applied field of the Sm3+ 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 Sm2+ Van Vleck susceptibility as well as 1% paramagnetic impurities with μeff=5.2(1)μB. This indicates the diamagneticlike Sm3+ magnetism is only a portion of the net magnetization, partially offsetting the response of paramagnetic impurities known within the bulk.

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Magnetic dichroism in the Kondo insulator SmB6

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