Possible signatures of mixed-parity superconductivity in doped polar SrTiO3 films

Schumann, Timo; Galletti, Luca; Jeong, Hanbyeol; Ahadi, Kaveh; Strickland, William M.; Salmani-Rezaie, Salva; Stemmer, Susanne

doi:10.1103/PhysRevB.101.100503

Title: Possible signatures of mixed-parity superconductivity in doped polar $SrTi O_{3}$ films

Journal Article · 23 March 2020 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.101.100503 · OSTI ID:1605930

Schumann, Timo ^[1];

^[2];

^[2]; Ahadi, Kaveh ^[2];

^[2]; Salmani-Rezaie, Salva ^[2]; Stemmer, Susanne ^[2]

Univ. of California, Santa Barbara, CA (United States); University of California, Santa Barbara
Univ. of California, Santa Barbara, CA (United States)

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.

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Research Organization:: Univ. of California, Santa Barbara, CA (United States)

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

Grant/Contract Number:: SC0020305

OSTI ID:: 1605930

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 10 Vol. 101; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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