Site-selective nuclear magnetic relaxation time in a superconducting vortex state

Details Site-selective nuclear magnetic relaxation time in a superconducting vortex state Site-selective nuclear magnetic relaxation time in a superconducting vortex state

2000-04-26

arxiv.org/abs/cond-mat/0004424v1

J. Phys. Soc. Jpn. Vol. 69 No. 12, 3943 (2000)

Physics

Condensed Matter

Superconductivity

14Pages, 26 figures, revtex

Scientific paper

10.1143/JPSJ.69.3943

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.

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