Abstract
A system of equations is obtained for the order parameters Δnm and the chemical potential μ of two-band superconductors with low carrier densities at T=0. The limiting case of μn<0, corresponding to a Bose condensate of localized pairs in both bands, is considered, and all possible inter- and intraband interactions are taken into account. For Δ 2nm /μ 2n,m ≪1, the above system of equations is reduced to a system of linear equations whose analytical solutions are found. The dependences of Δnm and μ on electron-electron interaction constants and carrier densities are analyzed.
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Translated from Teoreticheskaya i Matematicheskaya Fizika. Vol. 105, No. 3. pp. 491–502. December, 1995.
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Palistrant, M.E. The influence of overlapping energy bands on the superconductivity of localized bose-condensate pairs atT=0. Theor Math Phys 105, 1593–1602 (1995). https://doi.org/10.1007/BF02070881
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DOI: https://doi.org/10.1007/BF02070881