II.1 Magnesium diboride and the two-band scenario
We investigate properties of nanosize two-gap superconductivity by using a twosublevel model in the framework of a mean field approximation. A model corresponding to a nanosize two-gap superconductivity is presented, and the partition function of the nanosize system is analytically derived by using a path integral approach. A definition of the critical level spacing of the two-gap superconductivity is also presented, and we discuss condensation energy and parity gap of the two-gap superconductivity in relation to the size dependence of those properties with two bulk gaps and effective pair scattering process between two sublevels.
KeywordsPartition Function Ground State Energy Size Dependence Level Spacing Path Integral Approach
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