MAGNETIC AND OPTICAL STUDIES IN K3C60

We report the observation of new phase of bulk superconducting K3C60 w ith anomalous magnetic properties which suggest the presence of p-wave superconductivity. The samples are prepared by mixing stoichiometric amounts of K and C-60 and annealed in vacuum for a period of 5 days at 500 degrees C. The magnetic susceptibility showed a temperature-hyste resis pattern which was positive at 0.2 G and negative at 2 G or above . Two distinct T-c onsets were seen at 0.2 G while three distinct T-c onsets were seen at higher magnetic fields. Photoluminescence and X-ra y measurements suggested the possibility of polymerization of the C-60 molecules. A comparison with K3C60 samples annealed at 400 degrees C for 5 days indicated that the annealing temperature was critical to th e final product outcome.