Investigation of magnetic properties of Rb3C60 single crystal fullerene using torque experiments

For the first time, magnetic properties of fullerides have been studied using a torque technique. A Rb3C60 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 Tc = 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.