SCALING LAW FOR VORTEX DYNAMICS IN RB3C60 SUPERCONDUCTOR

AC susceptibility of the Rb3C60 superconductor shows a weak dependence on ac magnetic-field frequency f. The temperature, T-p, where chi '' is maximum, rises with increasing frequency and the effect is enhanced as the de magnetic-field amplitude H-dc is increased. The temperature is found to obey a scaling law (1 - T-p/T-c)(3/2) = 1.9 x 10(-4)H(dc) [ln(f(0)/f) + 23] + 8 x 10(-5)[ln(f(0)/f) + 23], where f(0) (approxima te to 10(10) s(-1)) is a characteristic frequency and H-dc is in tesla . The scaling relationship is in good agreement with the predicted equ ation based on the model of thermally activated flux motion.