Nanocalorimetric evidence for nematic superconductivity in the doped topological insulator Sr0.1Bi2Se3

Willa, Kristin; Willa, Roland; Song, Kok Wee; Gu, G. D.; Schneeloch, John A.; Zhong, Ruidan; Koshelev, Alexei E.; Kwok, Wai-Kwong; Welp, Ulrich

doi:10.1103/PhysRevB.98.184509

Title: Nanocalorimetric evidence for nematic superconductivity in the doped topological insulator ${Sr}_{0.1} {Bi}_{2} {Se}_{3}$

Journal Article · Mon Nov 19 00:00:00 EST 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.184509· OSTI ID:1485254

Willa, Kristin ^[1]; Willa, Roland ^[1]; Song, Kok Wee ^[1]; Gu, G. D. ^[2]; Schneeloch, John A. ^[3]; Zhong, Ruidan ^[4]; Koshelev, Alexei E. ^[1]; Kwok, Wai-Kwong ^[1]; Welp, Ulrich ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Stony Brook Univ., NY (United States). Dept. of Materials Science and Engineering

Spontaneous rotational-symmetry breaking in the superconducting state of doped Bi2Se3 has attracted significant attention as an indicator for topological superconductivity. In this paper, high-resolution calorimetry of the single-crystal Sr_0.1Bi₂Se₃ provides unequivocal evidence of a twofold rotational symmetry in the superconducting gap by a bulk thermodynamic probe, a fingerprint of nematic superconductivity. The extremely small specific heat anomaly resolved with our high-sensitivity technique is consistent with the material's low carrier concentration proving bulk superconductivity. The large basal-plane anisotropy of H-c(2) (Gamma(exp) = 3.5) is attributed to a nematic phase of a two-component topological gap structure eta = (eta(1), eta(2)) and caused by a symmetry-breaking energy term delta (vertical bar eta(1)vertical bar(2) - vertical bar eta(2)vertical bar(2))T-c. A quantitative analysis of our data excludes more conventional sources of this twofold anisotropy and provides an estimate for the symmetry-breaking strength delta approximate to 0.1, a value that points to an onset transition of the second order parameter component below 2 K.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

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

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

OSTI ID:: 1485254

Alternate ID(s):: OSTI ID: 1482765; OSTI ID: 1490687

Report Number(s):: BNL-209668-2018-JAAM

Journal Information:: Physical Review B, Vol. 98, Issue 18; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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Evidence for singular-phonon-induced nematic superconductivity in a topological superconductor candidate Sr0.1Bi2Se3 Wang, Jinghui; Ran, Kejing; Li, Shichao Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-10942-2	journal	June 2019
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Nematic superconductivity in doped Bi2Se3 topological superconductors Yonezawa, Shingo arXiv https://doi.org/10.48550/arxiv.1812.01378	text	January 2018
Generalized Anderson's theorem for superconductors derived from topological insulators Andersen, Lionel; Ramires, Aline; Wang, Zhiwei arXiv https://doi.org/10.48550/arxiv.1908.08766	text	January 2019

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Title: Nanocalorimetric evidence for nematic superconductivity in the doped topological insulator Sr 0.1 Bi 2 Se 3

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Title: Nanocalorimetric evidence for nematic superconductivity in the doped topological insulator ${Sr}_{0.1} {Bi}_{2} {Se}_{3}$