2011/07/31 by Karen Michaeli, Andrew C. Potter, Patrick A. Lee +1 · 6 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Charge (physics) #Condensed matter physics #Cooper pair #Electronic and Structural Properties of Oxides #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Magnetism #Physics #Quantum mechanics #Superconductivity #cond-mat.mes-hall #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.108.117003
published as K. Michaeli, A.C. Potter, and P.A. Lee, Phys. Rev. Lett. 108, 117003 (2012) · 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
openalex publication_date 2012/03/12 · arxiv created 2012/03/13 · arxiv updated 2012/03/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.