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Condensed Matter > Superconductivity
Title: Microscopic Theory of Cooper-pair fluctuations in a 2D Electron System with Strong Spin-Orbit Scatterings: Phase Separation and Large Magnetoresistance
(Submitted on 4 Mar 2024 (v1), last revised 30 Mar 2024 (this version, v2))
Abstract: A microscopic theory of Cooper-pair fluctuations (CPFs) in a 2D electron system with strong spin-orbit scatterings is presented to account for the observation, at low temperatures, of large magnetoresistance (MR) above a crossover field to superconductivity in electron-doped SrTiO$_{3}$/LaAlO$% _{3} $ interfaces. It is found that, while the conventional (diagrammatic) microscopic theory of superconducting fluctuations fails to account for the pronounced MR, an extension of the theory, which introduces a proper definition of the CPFs density, reveals an operative mechanism of this intriguing effect. Phase separation due to Coulomb repulsion, from the rarefying unpaired normal-state electron gas, following field-induced condensation of CPFs in real-space mesoscopic puddles, are in the core of this mechanism. These findings enable us to amend the state-of-the-art microscopic theory, in a consistent manner with the time dependent GL functional approach used previously in an extensive account of the experimentally reported effect.
Submission history
From: Vladimir Zhuravlev [view email][v1] Mon, 4 Mar 2024 15:20:23 GMT (6727kb,D)
[v2] Sat, 30 Mar 2024 13:45:10 GMT (6727kb,D)
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