Superconducting and Ferromagnetic Phases in SrTiO3/LaAlO3 Oxide Interface Structures: Possibility of Finite Momentum Pairing

Karen Michaeli, Andrew C. Potter, and Patrick A. Lee
Phys. Rev. Lett. 108, 117003 – Published 12 March 2012
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Abstract

We introduce a model to explain the observed ferromagnetism and superconductivity in LAO/STO oxide interface structures. Because of 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 a Fulde-Ferrell-Larkin-Ovchinikov-type condensate of Cooper pairs at finite momentum, which is surprisingly robust in the presence of strong disorder.

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  • Received 27 July 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.117003

© 2012 American Physical Society

Authors & Affiliations

Karen Michaeli, Andrew C. Potter, and Patrick A. Lee

  • Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

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Issue

Vol. 108, Iss. 11 — 16 March 2012

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