COMPARATIVE-STUDY OF SUPERCONDUCTING K2CSC60, RB3C60 AND RB2CSC60

High quality ternary and binary alkali metal doped C-60 compounds are investigated by using ac susceptibility techniques. The ac response ch i = chi' - i chi'' is studied as a function of temperature and applied ac magnetic field strength. The results are interpreted in terms of B ean's critical state model and clear experimental evidence fora linear temperature dependence of the intragrain critical current density j(c )(T) is given.