Superconducting and Ferromagnetic Phases in SrTiO[subscript 3]/LaAlO[subscript 3] Oxide Interface Structures: Possibility of Finite Momentum Pairing
Name
Michaeli-2012-Superconducting and Ferromagnetic Phases in SrTiO3.pdf
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216.89 KB
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Author(s)
Michaeli, Karen
Potter, Andrew Cole
Lee, Patrick A.
Alternative Title
Superconducting and Ferromagnetic Phases in SrTiO3/LaAlO3 Oxide Interface Structures: Possibility of Finite Momentum Pairing
Date Issued
March 2012
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Michaeli, Karen, Andrew Potter, and Patrick Lee. “Superconducting and Ferromagnetic Phases in SrTiO_{3}/LaAlO_{3} Oxide Interface Structures: Possibility of Finite Momentum Pairing.” Physical Review Letters 108.11 (2012): Web. 4 May 2012. © 2012 American Physical Society
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.108.117003
