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Title: Possible signatures of mixed-parity superconductivity in doped polar SrTi O 3 films

Abstract

Superconductors that possess both broken spatial inversion symmetry and spin-orbit interactions exhibit a mix of spin singlet and triplet pairing. In this work, we report on measurements of the superconducting properties of electron-doped, strained SrTiO3 films. These films have an enhanced superconducting transition temperature and were previously shown to undergo a transition to a polar phase prior to becoming superconducting.We show that some films show signatures of an unusual superconducting state, such as an in-plane critical field that is higher than both the paramagnetic and orbital pair breaking limits. Furthermore, nonreciprocal transport, which reflects the ratio of odd versus even pairing interactions, is observed. Together, these characteristics indicate that these films provide a tunable platform for investigations of unconventional superconductivity.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1]
  1. Univ. of California, Santa Barbara, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF)
OSTI Identifier:
1605930
Alternate Identifier(s):
OSTI ID: 1605962
Grant/Contract Number:  
SC0020305; DMR-1720256
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 10; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Schumann, Timo, Galletti, Luca, Jeong, Hanbyeol, Ahadi, Kaveh, Strickland, William M., Salmani-Rezaie, Salva, and Stemmer, Susanne. Possible signatures of mixed-parity superconductivity in doped polar SrTiO3 films. United States: N. p., 2020. Web. doi:10.1103/PhysRevB.101.100503.
Schumann, Timo, Galletti, Luca, Jeong, Hanbyeol, Ahadi, Kaveh, Strickland, William M., Salmani-Rezaie, Salva, & Stemmer, Susanne. Possible signatures of mixed-parity superconductivity in doped polar SrTiO3 films. United States. doi:https://doi.org/10.1103/PhysRevB.101.100503
Schumann, Timo, Galletti, Luca, Jeong, Hanbyeol, Ahadi, Kaveh, Strickland, William M., Salmani-Rezaie, Salva, and Stemmer, Susanne. Mon . "Possible signatures of mixed-parity superconductivity in doped polar SrTiO3 films". United States. doi:https://doi.org/10.1103/PhysRevB.101.100503. https://www.osti.gov/servlets/purl/1605930.
@article{osti_1605930,
title = {Possible signatures of mixed-parity superconductivity in doped polar SrTiO3 films},
author = {Schumann, Timo and Galletti, Luca and Jeong, Hanbyeol and Ahadi, Kaveh and Strickland, William M. and Salmani-Rezaie, Salva and Stemmer, Susanne},
abstractNote = {Superconductors that possess both broken spatial inversion symmetry and spin-orbit interactions exhibit a mix of spin singlet and triplet pairing. In this work, we report on measurements of the superconducting properties of electron-doped, strained SrTiO3 films. These films have an enhanced superconducting transition temperature and were previously shown to undergo a transition to a polar phase prior to becoming superconducting.We show that some films show signatures of an unusual superconducting state, such as an in-plane critical field that is higher than both the paramagnetic and orbital pair breaking limits. Furthermore, nonreciprocal transport, which reflects the ratio of odd versus even pairing interactions, is observed. Together, these characteristics indicate that these films provide a tunable platform for investigations of unconventional superconductivity.},
doi = {10.1103/PhysRevB.101.100503},
journal = {Physical Review B},
number = 10,
volume = 101,
place = {United States},
year = {2020},
month = {3}
}

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