Upper-Critical-Field-Temperature Phase Diagram of Alkali-Metal-Intercalated C60Superconductors

摘要

The temperature dependences of the upper critical field Hc2(n were measured overa broad range for both K3C60 and Rb3C60 superconductors. We found H,2(0) to be 28 T for K3C60 and 38 T for Rb3C60 corresponding to the Ginzburg-Landau coherence length of 34 and 30A. The H-T phase diagrams do not show qualitative difference from the behavior of a conventional type-II superconductor.