两带模型与MgB_2的超导电性

Two-band model and MgB_2 superconductivity

文中基于两带模型,通过引入非电-声短程相互作用,在弱耦合极限下按实验结果选定一组参数,同时得到了MgB2超导体的临界温度、同位素效应指数、零温能隙及比热的跃变,这些结果与实验相符合。

By introducing non - electron - phonon short - range interaction in two - band model, we derive the equations of the critical temperature, the isotope effect exponent, the zero temperature gaps and the specific heat jump of MgB2 superconductor in weak - coupling limit. We calculate these physical quantities with the same parameters supplied by experiments, and the results are consistent with experi- mental data.