Structure and properties of superconducting and nonsuperconducting alkali-metal fullerides axc60 (A = Na, K, Rb, or Cs)
作者： John B. Wiley , Shiou-Mei Huang , Shinho Cho , François Diederich , Robert L. Whetten
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摘要: Shielding diamagnetism and X-ray powder diffraction were used to characterize alkali-metal fullerides of sodium, potassium, rubidium, cesium. The superconducting phase in both the potassium rubidium systems has composition A3C60 a face centered cubic structure with alkali metal filling all octahedral tetrahedral sites close packed C60, layers. High pressure magnetic susceptibility measurements on K3C60 showed negative dependence transition temperature −0.78 K/kbar. No evidence for superconductivity was observed either sodium or cesium systems, even though Na3C60 appears isostructural Rb3C60.
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