Investigation of Magnetic Properties of Rb_3C_(60) Single Crystal Fullerenes Using Torque Experiments

摘要

For the first time, magnetic properties of fullerides have been studied using a torque technique. A Rb_3C_(60) single crystal has been investigated in these experiments. It was shown that this method is sensitive to the structural phase transition in both superconducting and normal states. In the superconducting state a transition at T_c = 28 K was observed and a pinning force of the magnetic vortices has been estimated. In the normal state, the transition from s.c. to f.c.c. structure has been indicated. Also a very strong magnetic response has been observed at temperatures T ～ 200 - 250 K, which may be explained in terms of the rearrangement on the magnetic system in the material.