Spin fluctuations and the superconducting state in doped insulators |
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Authors: | A I Agafonov É A Manykin |
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Institution: | (1) Institute of Superconductivity and Solid State Physics, Kurchatov Institute, 123182 Moscow, Russia |
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Abstract: | We propose a model of electron pairing via spin fluctuations in doped insulators. The bare states for the superconducting
condensate correspond to impurity bands in the original band gap of the undoped material. We obtain a complete set of equations
for the superconducting state. We show that fermion pairing in impurity bands of extended states is possible, and thus so
is superconductivity, if localized spin-0 bosons are produced. The latter are necessarily accompanied by localized spin-1
bosons, which are responsible for the relationship between singlet and triplet pairing channels of quasiparticles.
Zh. éksp. Teor. Fiz. 114, 1765–1784 (November 1998) |
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