Anomalous Temperature Dependence of Spin Susceptibility around a Nonmagnetic Impurity in High-Tc Cuprate Superconductors

Abstract

Local magnetic properties around a nonmagnetic impurity are investigated in high-Tc cuprate superconductors. We consider a model two-dimensional d-wave superconductor with strong antiferromagnetic (AF) spin fluctuations and calculate the spin susceptibility around the impurity. We show that the uniform susceptibility, which is usually suppressed in spin-singlet superconductivity, is enhanced at low temperatures around the impurity when the impurity scattering is in the unitarity limit. This anomalous behavior is more remarkable when the impurity potential is extended spatially and the AF spin fluctuations are stronger. As the origin of this phenomenon, we point out the importance of (1) a low-energy bound state around the impurity and (2) a mode-mode coupling effect which connects the AF spin fluctuations with the uniform susceptibility. Our results can explain the anomalous temperature dependence of the Knight shift on Li which was recently observed in YBa_2(Cu_{1-x}Li_x$)_3O_{6+y}.

14 pages, 9 figures

References in corpus (2)

• Spin Dynamics near the Superconductor-to-Insulator Transition in Impurity-Doped YBa2Cu4O8
• Cu NQR study of host and guest spin dynamics in impurity-doped YBa2Cu4O8

Cited by in corpus (10)

• Defects in correlated metals and superconductors
• Disorder-Induced Static Antiferromagnetism in Cuprate Superconductors
• Antiferromagnetic correlations and impurity broadening of NMR linewidths in cuprate superconductors
• Zn-Neighbor Cu NQR in Zn-Substituted YBa2Cu3O7-d and YBa2Cu4O8
• Breakdown of universal transport in correlated d-wave superconductors
• Local modulations of the spin-fluctuation mediated pairing interaction by impurities in d-wave superconductors
• Coexistence of Superconductivity and Ferromagnetism in Dilute Co-doped $La_{1.89} Ce_{0.11} Cu O_{4\pm\d}$ System
• Field-induced local moments around nonmagnetic impurities in metallic cuprates
• Quantum Monte Carlo study of a nonmagnetic impurity in the two-dimensional Hubbard model
• Spectral Distribution of Cu Nuclear Spin-Lattice Relaxation Time in Superconducting Bi2Sr2CaCu2O8+d