AN ATTEMPT AT A RESONATING MEAN-FIELD THEORETICAL DESCRIPTION OF THERMAL BEHAVIOR OF TWO-GAP SUPERCONDUCTIVITY

作者：Nishiyama Seiya^*; da Providencia Joao; Providencia Constanca; Ohnishi Hiromasa

来源：International Journal of Modern Physics B, 2013, 27(17): 1350079.

DOI：10.1142/S0217979213500793

• Res-MF theory
• BCS model
• two-gap superconductivity

The resonating mean-field theory (Res-MFT) has been applied and shown to effectively describe two-gap superconductivity (SC). Particularly at T = 0 using a suitable chemical potential, the two-gap SC in MgB2 has been well described by the Res-Hartree-Bogoliubov theory (Res-HBT). The Res-HB ground state generated with HB wavefunctions almost exhausts the ground-state correlation energy in all the correlation regimes. In this paper we make an attempt at a Res-MF theoretical description of thermal behavior of the two-gap SC. In an equal energy-gap case we find a new formula leading to a higher critical temperature T-c than the T-c of the usual HB formula.

• 出版日期2013-7-10