Superconductivity and Localization in Disordered Systems:A Local Gauge Invariant Approach

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概要

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• A new tight binding theory for superconductivity in disordered systems isconstructed on the basis of local gauge invariant n orbital models. The large nlimit realizes and justifies BCS type results for weak coupling and arbitrarilynarrow bands as exact solutions including modifications from the variable densityof states. The Inn expansion provides a systematic treatment of superconducting-,localization-, and magnetic fluctuations and of Coulomb repulsion. As firstapplications we derive i) deviations from Anderson's theorem due to the densityof states variation and ii) logarithmic reduction of the critical concentrationof magnetic impurities due to localization in 2D systems and critical reductionof T. in 3D due to critically decreased spinflip lifetime near the mobility edge(difl'usion localization). A similar effect is found for the upper critical magneticfield and is compared with recent theories of Fukuyama and Maekawa et at.

• 社団法人日本物理学会の論文
• 1983-10-15

著者

• Oppermann Reinhold

  Institut Fur Theoretische Phesik Ruprecht-karls-universitat

• Oppermann Reinhold

  Institut für Theoretische Physik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

関連論文

• Superconductivity and Localization in Disordered Systems:A Local Gauge Invariant Approach
• Spin--Orbit Interactions in a Quasi-Two-Dimensional Electron Gas with Finite Thickness

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