Site-selective nuclear magnetic relaxation time in a superconducting vortex state
Abstract
The temperature and field dependences of the site-selective nuclear spin relaxation time T_1 around vortices are studied comparatively both for s-wave and d-wave superconductors, based on the microscopic Bogoliubov-de Gennes theory. Reflecting low energy electronic excitations associated with the vortex core, the site selective temperature dependences deviate from those of the zero-field case, and T_1 becomes faster with approaching the vortex core. In the core region, T_1^{-1} has a new peak below the superconducting transition temperature T_c. The field dependence of the overall T_1(T) behaviors for s-wave and d-wave superconductors is investigated and analyzed in terms of the local density of states. The NMR study by the resonance field dependence may be a new method to probe the spatial resolved vortex core structure in various conventional and unconventional superconductors.
Keywords
Cite
@article{arxiv.cond-mat/0004424,
title = {Site-selective nuclear magnetic relaxation time in a superconducting vortex state},
author = {Mitsuaki Takigawa and Masanori Ichioka and Kazushige Machida},
journal= {arXiv preprint arXiv:cond-mat/0004424},
year = {2009}
}
Comments
14Pages, 26 figures, revtex