Condensed Matter Seminar

TWO-GAP SUPERCONDUCTIVITY IN MgB2

Sergei P. Kruchinin
Bogolyubov Institute for Theoretical Physics, Kiev,Ukraine

Friday, November 3, 2006 - 4:00 P.M., NSH 184

Recent discovery of superconductivity in MgB2 has been much attracted great interest with multi-gap superconductivity.  We using our two-band model for the explanation of two coupled superconductivity gaps for MgB2. To study the effect of the increasing of Tc in MgB2 due to the enhanced interband  pairing scattering. We have investigated properties of nanosize two-gap superconductivity by using a two-sublevel 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. We discuss the 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.