1998/01/09 by Kim, Yong-Jihn, Chang, K. J.
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · doi:10.48550/arxiv.cond-mat/9801071
It has been observed that impurity doping and/or ion-beam-induced damage in high Tc superconductors cause a metal-insulator transition and thereby suppress the critical temperature. Based on our recent theory of the weak localization effect on superconductivity, we examine the variation of Tc with increasing of impurity concentration \rm (x) in \rmLa1.85Sr0.15Cu1-xAxO4 systems, where A = Fe, Co, Ni, Zn, or Ga. We find that the doping impurity decreases the scattering matrix elements for electron-electron attractions, such as Vnn'=-V[1-2\over πkFℓ ln(L/ℓ)], where L and ℓ are the inelastic and elastic mean free paths, respectively. Using the mean free path ℓ determined from resistivity data, we find good agreements between our calculated values for Tc and experimental data except for Ni-doped samples, where Ni impurities may enhance the pairing interaction.