Upper-critical-field–temperature phase diagram of alkali-metal-intercalated C60 superconductors

C. E. Johnson; H. W. Jiang; K. Holczer; R. B. Kaner; R. L. Whetten; F. Diederich

doi:10.1103/PhysRevB.46.5880

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Upper-critical-field–temperature phase diagram of alkali-metal-intercalated C60 superconductors

C. E. Johnson, H. W. Jiang, K. Holczer, R. B. Kaner, R. L. Whetten, F. Diederich

DOI 10.1103/PhysRevB.46.5880 · Physical Review B

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Abstract

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

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18	Pressure not reported	onset
Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	28	Pressure not reported	onset