$^{87}Rb$ NMR relaxation and vortex dynamics in $Rb_3C_{60}$

Özet

$^{87}Rb$ NMR relaxation measurements in superconducting fullerene $Rb_3C_{60}$ for various values of the external field are reported. In the normal state the results are in agreement with $T_1T$= Constant. Below $T_c$, while no evidence of Hebel-Slichter peak is present in temperature dependence of $T_1^{-1}$, maxima are observed in $T_2^{-1}$ at T = 22K characteristic of vortex field fluctuation. $T_1$ shows an anomalous field dependence not yet explained.