Observation of Coexisting Weak Localization and Superconducting Fluctuations in Strained Sn1–xInxTe Thin Films

Wang, Jiashu; Powers, William; Zhang, Zhan; Smith, Michael; McIntosh, Bradlee J.; Bac, Seul Ki; Riney, Logan; Zhukovskyi, Maksym; Orlova, Tatyana; Rokhinson, Leonid P.; Hsu, Yi-Ting; Liu, Xinyu; Assaf, Badih A.

doi:10.1021/acs.nanolett.1c04370

Title: Observation of Coexisting Weak Localization and Superconducting Fluctuations in Strained Sn_1–xIn_xTe Thin Films

Journal Article · 10 January 2022 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.1c04370 · OSTI ID:1846793

Wang, Jiashu ^[1]; Powers, William ^[1]; Zhang, Zhan ^[2]; Smith, Michael ^[1]; McIntosh, Bradlee J. ^[1]; Bac, Seul Ki ^[1]; Riney, Logan ^[1]; Zhukovskyi, Maksym ^[1]; Orlova, Tatyana ^[1]; Rokhinson, Leonid P. ^[3]; Hsu, Yi-Ting ^[1];

^[1];

^[1]

Univ. of Notre Dame, IN (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Purdue Univ., West Lafayette, IN (United States)

Topological superconductors have attracted tremendous excitement as they are predicted to host Majorana zero modes that can be utilized for topological quantum computing. Candidate topological superconductor Sn_1–xIn_xTe thin films (0 < x < 0.3) grown by molecular beam epitaxy and strained in the (111) plane are shown to host quantum interference effects in the conductivity coexisting with superconducting fluctuations above the critical temperature T_c. An analysis of the normal state magnetoresistance reveals these effects. A crossover from weak antilocalization to localization is consistently observed in superconducting samples, indicating that superconductivity originates dominantly from charge carriers occupying trivial states that may be strongly spin–orbit split. A large enhancement of the conductivity is observed above T_c, indicating the presence of superconducting fluctuations. Furthermore, our results motivate a re-examination of the debated pairing symmetry of this material when subjected to quantum confinement and lattice strain.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1846793

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 2 Vol. 22; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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77 NANOSCIENCE AND NANOTECHNOLOGY
layers
magnetic properties
magnetoresistance
superconductivity
thin films
topological insulator

Title: Observation of Coexisting Weak Localization and Superconducting Fluctuations in Strained Sn1–xInxTe Thin Films

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Title: Observation of Coexisting Weak Localization and Superconducting Fluctuations in Strained Sn_1–xIn_xTe Thin Films