Structure and physical properties of Cs3+αC60(α=0.0-1.0) under ambient and high pressures
2002
The intermediate phases Cs 3 + α C 6 0 (α=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 Cs 3 + α C 6 0 (a = 0.0-1.0) can be indexed as a mixture of the body-centered-orthorhombic (bco) and cubic (A 15) phases. The A 15 phase diminishes above 30 kbar. The broad ESR peak due to the conduction electron (c-ESR) is observed only for the phases around α=0.0 in Cs 3 + α C 6 0 . The resistivity of the Cs 3 + α C 6 0 (α≠0) 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 Cs 3 + α C 6 0 (α≠0). These results present that bco phase of Cs 3 + α C 6 0 (α=0) is a final candidate for a pressure-induced superconductor.
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