Nuclear Spin—Spin Relaxation in Superconducting Mixed-State Vanadium
We have measured the rate of dipole-dipole energy relaxation in the mixed state of vanadium and found anomalously rapid relaxation. Time constants of the order of 10 msec are observed, whereas the corresponding relaxation times for nuclear Zeeman energy are often of the order of seconds.1 The relaxation rate is generally observed to increase as the magnetic field gradients in the sample increase. For fixed applied fields the field variation in the vortex structure increases as the temperature is lowered2 and the relaxation rate is observed to increase. This is in contrast to the relaxation rate of Zeeman energy in the mixed state at low temperatures, which decreases as the temperature is lowered.1
KeywordsRelaxation Rate Mixed State Magnetic Field Gradient Vortex Center Spin Diffusion
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