Link between the Superconducting Dome and Spin-Orbit Interaction in the (111) LaAlO3/SrTiO3 Interface

P. K. Rout, E. Maniv, and Y. Dagan
Phys. Rev. Lett. 119, 237002 – Published 4 December 2017
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Abstract

We measure the gate voltage (Vg) dependence of the superconducting properties and the spin-orbit interaction in the (111)-oriented LaAlO3/SrTiO3 interface. Superconductivity is observed in a dome-shaped region in the carrier density-temperature phase diagram with the maxima of superconducting transition temperature Tc and the upper critical fields lying at the same Vg. The spin-orbit interaction determined from the superconducting parameters and confirmed by weak-antilocalization measurements follows the same gate voltage dependence as Tc. The correlation between the superconductivity and spin-orbit interaction as well as the enhancement of the parallel upper critical field, well beyond the Chandrasekhar-Clogston limit, suggest that superconductivity and the spin-orbit interaction are linked in a nontrivial fashion. We propose possible scenarios to explain this unconventional behavior.

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  • Received 6 June 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.237002

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

P. K. Rout, E. Maniv, and Y. Dagan*

  • Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel Aviv 69978, Israel

  • *yodagan@post.tau.ac.il

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Issue

Vol. 119, Iss. 23 — 8 December 2017

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