Site-Selective Nuclear Magnetic Relaxation Time in a Superconducting Vortex State : Condensed Matter: Electronic Properties, etc.

概要

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On the basis of the microscopic Bogoliubov-de Gennes theory, the dependence of the nuclear spin relaxation time T_1 around vortices on the temperature and field is studied comparatively for both s-wave superconductor and d-wave superconductor. Reflecting low energy electronic excitations associated with the vortex core, the dependence of T_1 on the site and temperature 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 dependence of the overall T_1 (T) on the field for s-wave and d-wave superconductors is investigated and analyzed in terms of the local density of states. The NMR study by the dependence of T_1 on the resonance field may be a new method to probe the spatial resolved vortex core structure in various conventional and unconventional superconductors.
社団法人日本物理学会の論文
2000-12-15