Bound States in a Superconductor Containing a Magnetic Impurity

概要

論文の詳細を見る
The bound states associated with a magnetic impurity in a superconductor is studied, by making use of the Bethe-Salpeter equation for a quasi-particle (in the BCS state) and a quasi-fermion describing the impurity spin. The bound state energy is determined as a function of the s-d exchange potential J. In particular we find that the triplet bound state appears for all positive J(i.e., in the case of ferromagnetic coupling) and for J negative and Tk>Tco where Tk is the Kondo temperature and Tco is the superconducting transition temperature of the host metal, and that the singlet bound state appears for a negative J and Tk<Tco. These results are in complete agreement with recent calculations in the framework of the Smatrix theory. Furthermore we calculate the wave function of the bound state, which will be of importance in the calculation of the transition probability associated with the local interaction.
1970-10-25