Theory of vortex excitation imaging via an NMR relaxation measurement
Mitsuaki Takigawa, Masanori Ichioka, Kazushige Machida
Abstract
The temperature dependence of the site-dependent nuclear spin relaxation time T1 around vortices is studied in s-wave and d-wave superconductors.Reflecting low energy electronic excitations associated with the vortex core, temperature dependences deviate from those of the zero-field case, and T1 becomes faster with approaching the vortex core. In the core region, T1-1 has a new peak below Tc. The NMR study by the resonance field dependence may be a new method to prove the spatial resolved vortex core structure in various superconductors.
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