Link between the Superconducting Dome and Spin-Orbit Interaction in the (111) LaAlO\(_3\)/SrTiO\(_3\) Interface

We measure the gate voltage (\(V_g\)) dependence of the superconducting properties and the spin-orbit interaction in the (111)-oriented LaAlO\(_3\)/SrTiO\(_3\) interface. Superconductivity is observed in a dome-shaped region in the carrier density-temperature phase diagram with the maxima of superco...

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Bibliographic Details
Published in:arXiv.org 2017-12
Main Authors: Rout, P K, Maniv, E, Dagan, Y
Format: Article
Language:English
Subjects:
Carrier density
Critical field (superconductivity)
Dependence
Domes
Electric potential
Phase diagrams
Spin-orbit interactions
Superconductivity
Transition temperature
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Summary:We measure the gate voltage (\(V_g\)) dependence of the superconducting properties and the spin-orbit interaction in the (111)-oriented LaAlO\(_3\)/SrTiO\(_3\) interface. Superconductivity is observed in a dome-shaped region in the carrier density-temperature phase diagram with the maxima of superconducting transition temperature \(T_c\) and the upper critical fields lying at the same \(V_g\). The spin-orbit interaction determined from the superconducting parameters and confirmed by weak-antilocalization measurements follows the same gate voltage dependence as \(T_c\). 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1706.01717