Superconducting and normal-state anisotropy of the doped topological insulator Sr0.1Bi2Se3

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.

doi:10.1038/s41598-018-26032-0

Superconducting and normal-state anisotropy of the doped topological insulator Sr_0.1Bi₂Se₃

Journal Article · Wed May 16 00:00:00 EDT 2018 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-018-26032-0· OSTI ID:1439557

^[1]; ^[2]; Claus, H. ^[2]; ^[2]; ^[2]; Kwok, W. -K. ^[2]; Islam, Z. ^[2]; ^[3]; ^[4]; ^[4]; Welp, U. ^[2]

Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Notre Dame, Notre Dame, IN (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)

Sr_xBi₂Se₃ and the related compounds Cu_xBi₂Se₃ and Nb_xBi₂Se₃ have attracted considerable interest, as these materials may be realizations of unconventional topological superconductors. Superconductivity with T_c ~3 K in Sr_xBi₂Se₃ arises upon intercalation of Sr into the layered topological insulator Bi₂Se₃. Here we elucidate the anisotropy of the normal and superconducting state of Sr_0.1Bi₂Se₃ 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 Sr_0.1Bi₂Se₃ 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 Sr_xBi₂Se₃.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: Swiss National Science Foundation (SNSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; University of Notre Dame

Grant/Contract Number:: AC02-06CH11357; SC0012704

OSTI ID:: 1439557

Alternate ID(s):: OSTI ID: 1459173

Report Number(s):: BNL--207809-2018-JAAM; 140792

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 8; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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