Anomalous three-dimensional bulk ac conduction within the Kondo gap of SmB6 single crystals

Laurita, N. J.; Morris, C. M.; Koohpayeh, S. M.; Rosa, P. F.  S.; Phelan, W. A.; Fisk, Z.; McQueen, T. M.; Armitage, N. P.

doi:10.1103/PhysRevB.94.165154

Title: Anomalous three-dimensional bulk ac conduction within the Kondo gap of ${SmB}_{6}$ single crystals

Journal Article · Fri Oct 21 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.165154· OSTI ID:1392878

Laurita, N. J. ^[1]; Morris, C. M. ^[1]; Koohpayeh, S. M. ^[1]; Rosa, P. F. S. ^[2]; Phelan, W. A. ^[3]; Fisk, Z. ^[4]; McQueen, T. M. ^[3]; Armitage, N. P. ^[1]

Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter, Dept. of Chemistry
Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy

The Kondo insulator SmB 6 has long been known to display anomalous transport behavior at low temperatures, T < 5 K. In this temperatures range, a plateau is observed in the dc resistivity, contrary to the exponential divergence expected for a gapped system. Some recent theoretical calculations suggest that SmB ₆ may be the first topological Kondo insulator (TKI) and propose that the residual conductivity is due to topological surface states which reside within the Kondo gap. Since the TKI prediction many experiments have claimed to observe high mobility surface states within a perfectly insulating hybridization gap. We investigate the low energy optical conductivity within the hybridization gap of single crystals of SmB ₆ via time domain terahertz spectroscopy. Samples grown by both optical floating zone and aluminum flux methods are investigated to probe for differences originating from sample growth techniques. We find that both samples display significant three-dimensional bulk conduction originating within the Kondo gap. Although SmB ₆ may be a bulk dc insulator, it shows significant bulk ac conduction that is many orders of magnitude larger than any known impurity band conduction. The nature of these in-gap states and their coupling with the low energy spin excitons of SmB ₆ is discussed. In addition, the well-defined conduction path geometry of our optical experiments allows us to show that any surface states, which lie below our detection threshold if present, must have a sheet resistance of R / square ≥ 1000 Ω .

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC52-06NA25396; FG02-08Er46544; DMR 08-01253; FG02-08ER46544

OSTI ID:: 1392878

Alternate ID(s):: OSTI ID: 1329509

Report Number(s):: LA-UR-17-23576; PRBMDO; TRN: US1702709

Journal Information:: Physical Review B, Vol. 94, Issue 16; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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Screened moments and extrinsic in-gap states in samarium hexaboride Fuhrman, W. T.; Chamorro, J. R.; Alekseev, P. A. Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-018-04007-z	journal	April 2018
Mixed-valence insulators with neutral Fermi surfaces Chowdhury, Debanjan; Sodemann, Inti; Senthil, T. Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-018-04163-2	journal	May 2018
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Transport gap in SmB ₆ protected against disorder Eo, Yun Suk; Rakoski, Alexa; Lucien, Juniar Proceedings of the National Academy of Sciences, Vol. 116, Issue 26 https://doi.org/10.1073/pnas.1901245116	journal	June 2019
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Title: Anomalous three-dimensional bulk ac conduction within the Kondo gap of ${SmB}_{6}$ single crystals