Eo, Y. S., Wolgast, S., Rakoski, A., Mihaliov, D., Kang, B. Y., Song, M. S., Chow, B. K. B., Ciomaga Hatnean, Monica, Balakrishnan, Geetha, Fisk, Z., Saha, S. R., Wang, X., Paglione, J. and Kurdak, Ç. (2020) Comprehensive surface magnetotransport study of SmB6. Physical Review B (Condensed Matter and Materials Physics), 101 (15). 155109. doi:10.1103/PhysRevB.101.155109 ISSN 1098-0121.

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Abstract

After the theoretical prediction that SmB6 is a topological Kondo insulator, there has been an explosion of studies on the SmB6 surface. However, there is not yet an agreement on even the most basic quantities such as the surface carrier density and mobility. In this paper, we carefully revisit Corbino disk magnetotransport studies to find those surface transport parameters. We first show that subsurface cracks exist in the SmB6 crystals, arising both from surface preparation and during the crystal growth. We provide evidence that these hidden subsurface cracks are additional conduction channels, and the large disagreement between earlier surface SmB6 studies may originate from previous interpretations not taking this extra conduction path into account. We provide an update of more reliable magnetotransport data than the previous one (S. Wolgast et al., Phys. Rev. B 92, 115110) and find that the orders-of-magnitude large disagreements in carrier density and mobility come from the surface preparation and the transport geometry rather than the intrinsic sample quality. From this magnetotransport study, we find an updated estimate of the carrier density and mobility of 2.71×1013 (1/cm2) and 104.5 (cm2/Vsec), respectively. We compare our results with other studies of the SmB6 surface. By this comparison, we provide insight into the disagreements and agreements of the previously reported angle-resolved photoemission spectroscopy, scanning tunneling microscopy, and magnetotorque quantum oscillations measurements.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics Q Science > QD Chemistry Q Science > QH Natural history
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Topological dynamics, Electron transport, Photoemission , Scanning tunneling microscopy, Samarium -- Spectra
Journal or Publication Title:	Physical Review B (Condensed Matter and Materials Physics)
Publisher:	American Physical Society
ISSN:	1098-0121
Official Date:	8 April 2020
Dates:	Date Event 8 April 2020 Published 9 March 2020 Accepted 25 November 2019 Submitted
Volume:	101
Number:	15
Article Number:	155109
DOI:	10.1103/PhysRevB.101.155109
Status:	Peer Reviewed
Publication Status:	Published
Reuse Statement (publisher, data, author rights):	© 2020 American Physical Society
Access rights to Published version:	Restricted or Subscription Access
Copyright Holders:	American Physical Society
Date of first compliant deposit:	14 April 2020
Date of first compliant Open Access:	14 April 2020
Grant number:	EP/T005963/1
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID EP/T005963/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 DMR-1441965 National Science Foundation http://dx.doi.org/10.13039/501100008982 DMR-1643145 National Science Foundation http://dx.doi.org/10.13039/501100008982 DMR-1157490 National Science Foundation http://dx.doi.org/10.13039/501100008982 DMR-164477 National Science Foundation http://dx.doi.org/10.13039/501100008982 FA9550-14-1-0332 Air Force Office of Scientific Research http://dx.doi.org/10.13039/100000181 UNSPECIFIED University of Michigan http://dx.doi.org/10.13039/100007270

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