High-field superconductivity from atomic-scale confinement and spin-orbit coupling at (111)LaAlO₃/KTaO₃ interfaces

2024/11/08 by Ulderico Filippozzi, G. H. Kimbell, Filippozzi, Ulderico +15 · 1 citation
Engineering · Materials Science · #Advanced Materials Characterization Techniques #Electronic and Structural Properties of Oxides #FOS: Physical sciences #Iron-based superconductors research #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.2411.05668

openalex publication_date 2024/11/08 · openalex created_date 2024/11/15 · openalex updated_date 2026/07/28

Abstract

We study the superconducting critical fields of two-dimensional electron systems at (111)LaAlO₃/KTaO₃ interfaces as a function of electrostatic back-gating. Our work reveals inplane critical fields of unprecedented magnitudes at oxide interfaces. By comparing the critical fields in-plane and out-of-plane we discover an extremely anisotropic superconductor with an effective thickness below 1 nm and a 12-fold violation of the Chandrasekhar-Clogston paramagnetic limit. The analysis of magneto-transport indicates that the enhancement of the critical fields is due to an exceptionally thin superconducting layer and to a paramagnetic susceptibility suppressed by spin-orbit scattering.

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• Spin-dependent anisotropic electron-phonon coupling in KTaO₃

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