II.1 Magnesium diboride and the two-band scenario
We investigate two-band superconductivity in ultrasmall grain. The Richardson’s exact solution is extended to two-band systems, and a new coupled equation is derived according to the procedure of Richardson’s works. Parity gap and condensation energy of ultrasmall two-band superconducting grain are numerically obtained by solving the coupled equations. We discuss these properties in ultrasmall grain in relation to the correlation, interband interaction, and size dependence.
KeywordsCouple Equation Level Spacing Normal Band Condensation Energy Magnesium Diboride
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