Reports

Synthesis and Electronic Transport of Single Crystal K3C60

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Science  22 May 1992:
Vol. 256, Issue 5060, pp. 1190-1191
DOI: 10.1126/science.256.5060.1190

Abstract

Sizable single crystals of C6O have been synthesized and doped with potassium. Above the superconducting transition temperature Tc, the electrical resistivity p(T) displays a classic metal-like temperature dependence. The transition to the superconducting state at Tc = 19.8 K is extremely sharp, with a transition width ΔT < 200 mK. In contrast to transport behavior of doped polycrystalline and granular thin films, no anomalous fluctuations are observed near Tc in single crystal specimens.