Phase segregation of superconductivity and ferromagnetism at LaAlO${}_3$/SrTiO${}_3$ interface

Abstract

The highly conductive two-dimensional electron gas formed at the interface between insulating SrTiO${}_3$ and LaAlO${}_3$ shows low-temperature superconductivity coexisting with inhomogeneous ferromagnetism. The Rashba spin-orbit interaction with in-plane Zeeman field of the system favors $p_x\pm i{p}_y$-wave superconductivity at finite momentum. Owing to the intrinsic disorder at the interface, the role of spatial inhomogeneity on the superconducting and ferromagnetic states becomes important. We find that for strong disorder, the system breaks up into mutually excluded regions of superconductivity and ferromagnetism. This inhomogeneity-driven electronic phase separation accounts for the unusual coexistence of superconductivity and ferromagnetism observed at the interface.

9 pages, 10 figures

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Cited by in corpus (6)

• Multi-band theory of superconductivity at the LaAlO${}_3$/SrTiO${}_3$ interface
• Anomalous transport near the Lifshitz transition at the LaAlO${}_3$/SrTiO${}_3$ interface
• Observation of transient superconductivity at the LaAlO${}_3$/SrTiO${}_3$ interface
• Effect of spin-orbit interaction on the vortex dynamics in LaAlO${}_3$/SrTiO${}_3$ interfaces near the superconducting transition
• Inhomogeneous phase stiffness in two-dimensional $s$-wave disordered superconductors
• Electrically controlled quantum transition to an anomalous metal in 2D