d+s波超导体磁掺杂转变

Magnetic impurity transition in a d+s wave superconductor

研究了Anderson掺杂极限Δs/Δd《1的情况下,d+s波对称下的超导态。此模型包括哈密顿量中类似BSC项和自恰平均场似下的Anderson掺杂。随着掺杂中心数的增加或比率Δs/Δd的减小,可推出从低能下在费米能级附近具有双峰的态到N(0)≈(Δs/Δd)2态的转变。如果掺杂共振的能量为最小能量标度,则转变不连续。

We studied the superconducting state of d＋s symmetry with finite concentration of Anderson impurities in the limit Δs/Δd1.The model consisted of a BCS like term in the Hamiltonian and the Anderson impurity treated in the self-consistent mean field approximation.Increasing impurity concentration or lowering the ratio Δs/Δd drove the system through a transition from a state with two sharp peaks at low energies at the Fermi level to one with N（0）≈（Δs/Δd）2.This transition is discontinuous if the energy of the impurity resonance is the smallest energy scale in the problem.