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Title: Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal Bi 1 - x Sb x / Pt Junction Fabricated by Ion-Beam Techniques

Inducing superconductivity in a topological insulator can lead to novel quantum effects. However, experimental approaches to turn a topological insulator into a superconductor are limited. We report on superconductivity in topological insulator Bi 0.91Sb 0.09 induced via focused ion-beam deposition of a Pt thin film. The superconducting phase exhibits a Berezinski-Kosterlitz-Thouless transition, demonstrative of its two-dimensional character. From the in-plane upper critical field measurements, we estimate the superconducting thickness to be ~ 17 nm for a 5.5-μm-thick sample. Our results provide evidence that the interface superconductivity could originate from the surface states of Bi 0.91Sb 0.09.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-746859
Journal ID: ISSN 0031-9007; PRLTAO; 931609
Grant/Contract Number:
AC52-07NA27344; 15-LW-018; 16-SI-004
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 3; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BKT transition; conductivity; impurities in superconductors; superconducting fluctuations; superconducting phase transition; topological insulators; bilayer films; low-temperature superconductors; topological superconductors
OSTI Identifier:
1465266
Alternate Identifier(s):
OSTI ID: 1460484

Qu, Dong-Xia, Teslich, Nick E., Dai, Zurong, Chapline, George F., Schenkel, Thomas, Durham, Sean R., and Dubois, Jonathan. Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal Bi1-xSbx/Pt Junction Fabricated by Ion-Beam Techniques. United States: N. p., Web. doi:10.1103/PhysRevLett.121.037001.
Qu, Dong-Xia, Teslich, Nick E., Dai, Zurong, Chapline, George F., Schenkel, Thomas, Durham, Sean R., & Dubois, Jonathan. Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal Bi1-xSbx/Pt Junction Fabricated by Ion-Beam Techniques. United States. doi:10.1103/PhysRevLett.121.037001.
Qu, Dong-Xia, Teslich, Nick E., Dai, Zurong, Chapline, George F., Schenkel, Thomas, Durham, Sean R., and Dubois, Jonathan. 2018. "Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal Bi1-xSbx/Pt Junction Fabricated by Ion-Beam Techniques". United States. doi:10.1103/PhysRevLett.121.037001. https://www.osti.gov/servlets/purl/1465266.
@article{osti_1465266,
title = {Onset of a Two-Dimensional Superconducting Phase in a Topological-Insulator–Normal-Metal Bi1-xSbx/Pt Junction Fabricated by Ion-Beam Techniques},
author = {Qu, Dong-Xia and Teslich, Nick E. and Dai, Zurong and Chapline, George F. and Schenkel, Thomas and Durham, Sean R. and Dubois, Jonathan},
abstractNote = {Inducing superconductivity in a topological insulator can lead to novel quantum effects. However, experimental approaches to turn a topological insulator into a superconductor are limited. We report on superconductivity in topological insulator Bi0.91Sb0.09 induced via focused ion-beam deposition of a Pt thin film. The superconducting phase exhibits a Berezinski-Kosterlitz-Thouless transition, demonstrative of its two-dimensional character. From the in-plane upper critical field measurements, we estimate the superconducting thickness to be ~ 17 nm for a 5.5-μm-thick sample. Our results provide evidence that the interface superconductivity could originate from the surface states of Bi0.91Sb0.09.},
doi = {10.1103/PhysRevLett.121.037001},
journal = {Physical Review Letters},
number = 3,
volume = 121,
place = {United States},
year = {2018},
month = {7}
}

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