Kavli Affiliate: Andrea D. Caviglia
| First 5 Authors: Ulderico Filippozzi, Graham Kimbell, Davide Pizzirani, Siobhan McKeown Walker, Chiara Cocchi
| Summary:
We study the superconducting critical fields of two-dimensional electron
systems at (111)$mathrm{LaAlO_3/KTaO_3}$ 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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