Robust Surface States and Coherence Phenomena in Magnetically Alloyed SmB 6

Miao, Lin; Min, Chul-Hee; Xu, Yishuai; Huang, Zengle; Kotta, Erica C.; Basak, Rourav; Song, M.  S.; Kang, B.  Y.; Cho, B.  K.; Kißner, K.; Reinert, F.; Yilmaz, Turgut; Vescovo, Elio; Chuang, Yi-De; Wu, Weida; Denlinger, Jonathan D.; Wray, L. Andrew

doi:10.1103/physrevlett.126.136401

Robust Surface States and Coherence Phenomena in Magnetically Alloyed ${SmB}_{6}$

Journal Article · Wed Mar 31 00:00:00 EDT 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.126.136401· OSTI ID:1797365

Miao, Lin ^[1]; Min, Chul-Hee ^[2]; Xu, Yishuai ^[3]; Huang, Zengle ^[4]; Kotta, Erica C. ^[3]; Basak, Rourav ^[3]; Song, M. S. ^[5]; Kang, B. Y. ^[5]; Cho, B. K. ^[5]; Kißner, K. ^[2]; Reinert, F. ^[2]; Yilmaz, Turgut ^[6]; Vescovo, Elio ^[6]; Chuang, Yi-De ^[4]; ^[4]; Denlinger, Jonathan D. ^[7]; ^[3]

Southeast Univ., Nanjing (China). School of Energy and Environment
Universität Würzburg, Würzburg (Germany)
New York Univ. (NYU), NY (United States)
Rutgers Univ., Piscataway, NJ (United States)
Gwangju Institute of Science and Technology (GIST), Gwangju (Korea)
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Samarium hexaboride is a candidate for the topological Kondo insulator state, in which Kondo coherence is predicted to give rise to an insulating gap spanned by topological surface states. Here we investigate the surface and bulk electronic properties of magnetically alloyed Sm_1-x M_xB₆(M = Ce, Eu), using angle-resolved photoemission spectroscopy and complementary characterization techniques. Remarkably, topologically nontrivial bulk and surface band structures are found to persist in highly modified samples with up to 30% Sm substitution and with an antiferromagnetic ground state in the case of Eu doping. The results are interpreted in terms of a hierarchy of energy scales, in which surface state emergence is linked to the formation of a direct Kondo gap, while low-temperature transport trends depend on the indirect gap.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1797365

Report Number(s):: BNL--221679-2021-JAAM

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 126; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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