Superconductivity and Ferromagnetism in Oxide Interface Structures: Possibility of Finite Momentum Pairing

Abstract

We introduce a model to explain the observed ferromagnetism and superconductivity in LAO/STO oxide interface structures. Due to the polar catastrophe mechanism, 1/2 charge per unit cell is transferred to the interface layer. We argue that this charge localizes and orders ferromagnetically via exchange with the conduction electrons. Ordinarily this ferromagnetism would destroy superconductivity, but due to strong spin-orbit coupling near the interface, the magnetism and superconductivity can coexist by forming an FFLO-type condensate of Cooper pairs at finite momentum, which is surprisingly robust in the presence of strong disorder.

6 pages of Supplementary materials added containing details of calculation and further discussion of the FFLO state with disorder, references added, final version as published

References in corpus (7)

• Magnetic effects at the interface between nonmagnetic oxides
• Theory of ferromagnetic (III,Mn)V semiconductors
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• Coexistence of Magnetic Order and Two-dimensional Superconductivity at LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Coexistence of superconductivity and ferromagnetism in two dimensions
• Theory of 2D superconductor with broken inversion symmetry
• Shubnikov-de Haas oscillations in SrTiO3\LaAlO3 interface

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• Topological Fulde-Ferrel-Larkin-Ovchinnikov states in Spin-orbit Coupled Fermi Gases
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