Abstract
63/65 Cu/ 203/205 Tl-NMR study has been performed on the Zn-substituted high- T C cuprate TlBa 2 Ca(Cu 1- z Zn z ) 2 O 7+δ belonging to the over-doped region. The reduction rate in T C with Zn-concentration was much smaller than the lightly-doped cuprate La 1.85 Sr 0.15 CuO 4 , and showed a significant decrease with increasing hole concentration. The temperature dependence of the Cu-Knight shift in the superconducting state was successfully explained in terms of the partially closed d -wave model proposed by Ishida et al. The relation between the residual density of states in the superconducting state and the reduction rate of T C with Zn-concentration for slightly over-doped samples was well explained with Miyake's theoretical calculation on the potential scattering of the unitarity limit in the d -wave superconductor.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
