Theoretical studies on vortices in unconventional and conventional superconductors

Vortex imaging method by the site selective NMR is explained by self-consistently solving the Bogoliubov-de Gennes equation for both s-wave and d-wave pairings. We analyze the temperature dependence of the relation time T-1 using the resonance frequency at the intensity maximum, namely the saddle point T-1 experiments. The site selective T-1 data are shown to yield valuable information on low-lying electronic excitations around a vortex core.