Abstract
In high-temperature superconductors, fluctuating vortices are present even in the absence of an external magnetic field. These vortices lead to the relaxation of nuclear magnetic moments. Nuclear quadrupole resonance (NQR) experiments may thus yield information about the density and dynamics of vortices. To determine their contribution, the longitudinal and transverse NQR relaxation rates are expressed in terms of the magnetic-field correlation function for vanishing external field. The concept of a spin temperature is not applicable in this case. Instead, we employ the Bloch-Wangsness-Redfield theory to obtain the rates. The expressions for the rates are significantly different from the case of NMR (large external field). The correlation function is determined for bound vortex pairs subject to diffusive dynamics.
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