Structure and physical properties of Cs3+alpha C60 (alpha=0.0-1.0) under ambient and high pressures

Article

关键词: INDUCED TUNNELING CONDUCTION;    SINGLE-CRYSTAL K3C60;    RAMAN-SCATTERING;    CS3C60;    PHASE;    RB;    SUPERCONDUCTIVITY;    FULLERIDES;    TRANSPORT;    ESR;   

DOI  :  10.1103/PhysRevB.65.235425

来源: SCIE

【 摘 要 】

The intermediate phases Cs3+alphaC60 (alpha=0.0-1.0), have been prepared, and their structure and physical properties are studied by x-ray powder diffraction, Raman, ESR, electric conductivity, and ac susceptibility measurements under ambient and high pressures. The x-ray powder diffraction pattern of Cs3+alphaC60 (alpha=0.0-1.0) can be indexed as a mixture of the body-centered-orthorhombic (bco) and cubic (A15) phases. The A15 phase diminishes above 30 kbar. The broad ESR peak due to the conduction electron (c-ESR) is observed only for the phases around alpha=0.0 in Cs3+alphaC60. The resistivity of the Cs3+alphaC60 (alphanot equal0) sample follows the granular metal theory and/or Sheng model even in the sample exhibiting a broad ESR peak. No superconducting transition is observed up to 10.6 kbar in Cs3+alphaC60 (alphanot equal0). These results present that bco phase of Cs3+alphaC60 (alpha=0) is a final candidate for a pressure-induced superconductor.

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