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Title: Superconducting and normal-state anisotropy of the doped topological insulator Sr 0.1Bi 2Se 3

Abstract

Sr xBi 2Se 3 and the related compounds Cu xBi 2Se 3 and Nb xBi 2Se 3 have attracted considerable interest, as these materials may be realizations of unconventional topological superconductors. Superconductivity with T c ~3 K in Sr xBi 2Se 3 arises upon intercalation of Sr into the layered topological insulator Bi 2Se 3. Here we elucidate the anisotropy of the normal and superconducting state of Sr 0.1Bi 2Se 3 with angular dependent magnetotransport and thermodynamic measurements. High resolution x-ray diffraction studies underline the high crystalline quality of the samples. We demonstrate that the normal state electronic and magnetic properties of Sr 0.1Bi 2Se 3 are isotropic in the basal plane while we observe a large two-fold in-plane anisotropy of the upper critical field in the superconducting state. In conclusion, our results support the recently proposed odd-parity nematic state characterized by a nodal gap of Eu symmetry in Sr xBi 2Se 3.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4];  [2]
+ Show Author Affiliations
  1. Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Notre Dame, Notre Dame, IN (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Energy Frontier Research Center, Center for Emergent Superconductivity; University of Notre Dame; Swiss National Science Foundation (SNSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1439557
Alternate Identifier(s):
OSTI ID: 1459173
Report Number(s):
BNL-207809-2018-JAAM
Journal ID: ISSN 2045-2322; 140792; TRN: US1900625
Grant/Contract Number:  
AC02-06CH11357; SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Electronic properties and materials; Magnetic properties and materials; Superconducting properties and materials; Topological matter; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Smylie, M. P., Willa, K., Claus, H., Koshelev, A. E., Song, K. W., Kwok, W. -K., Islam, Z., Gu, G. D., Schneeloch, J. A., Zhong, R. D., and Welp, U. Superconducting and normal-state anisotropy of the doped topological insulator Sr0.1Bi2Se3. United States: N. p., 2018. Web. doi:10.1038/s41598-018-26032-0.
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Smylie, M. P., Willa, K., Claus, H., Koshelev, A. E., Song, K. W., Kwok, W. -K., Islam, Z., Gu, G. D., Schneeloch, J. A., Zhong, R. D., & Welp, U. Superconducting and normal-state anisotropy of the doped topological insulator Sr0.1Bi2Se3. United States. doi:10.1038/s41598-018-26032-0.
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Smylie, M. P., Willa, K., Claus, H., Koshelev, A. E., Song, K. W., Kwok, W. -K., Islam, Z., Gu, G. D., Schneeloch, J. A., Zhong, R. D., and Welp, U. Wed . "Superconducting and normal-state anisotropy of the doped topological insulator Sr0.1Bi2Se3". United States. doi:10.1038/s41598-018-26032-0. https://www.osti.gov/servlets/purl/1439557.
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@article{osti_1439557,
title = {Superconducting and normal-state anisotropy of the doped topological insulator Sr0.1Bi2Se3},
author = {Smylie, M. P. and Willa, K. and Claus, H. and Koshelev, A. E. and Song, K. W. and Kwok, W. -K. and Islam, Z. and Gu, G. D. and Schneeloch, J. A. and Zhong, R. D. and Welp, U.},
abstractNote = {SrxBi2Se3 and the related compounds CuxBi2Se3 and NbxBi2Se3 have attracted considerable interest, as these materials may be realizations of unconventional topological superconductors. Superconductivity with Tc ~3 K in SrxBi2Se3 arises upon intercalation of Sr into the layered topological insulator Bi2Se3. Here we elucidate the anisotropy of the normal and superconducting state of Sr0.1Bi2Se3 with angular dependent magnetotransport and thermodynamic measurements. High resolution x-ray diffraction studies underline the high crystalline quality of the samples. We demonstrate that the normal state electronic and magnetic properties of Sr0.1Bi2Se3 are isotropic in the basal plane while we observe a large two-fold in-plane anisotropy of the upper critical field in the superconducting state. In conclusion, our results support the recently proposed odd-parity nematic state characterized by a nodal gap of Eu symmetry in SrxBi2Se3.},
doi = {10.1038/s41598-018-26032-0},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {5}
}
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Journal Article:
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DOI:  10.1038/s41598-018-26032-0
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Figures / Tables:

Figure 1 Figure 1: (a) Crystal structure of SrxBi2Se3, with directions a (blue), a∗ (pink) and c (black) marked. The dopant Sr ion (blue) sits in the van der Waals gap between quintuple layers of Bi (green) and Se (red) ions. (b) The threefold symmetric basal plane. (c) Schematic presentation of themore » two-dimensional ∆4 superconducting gap with respect to a spherical Fermi surface. The ∆4 gap has basis functions (∆4x) with nodes on the mirror plane [depicted in (c)] and (∆4y) with deep minima in the perpendicular direction. This gap breaks the threefold crystal symmetry and gives rise to the nematic state with twofold symmetry.« less
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