Abstract
Precise electron spin resonance (ESR) spectroscopic studies have been done for K x C 60. Three ESR peaks corresponding to the three important crystal phases of K x C 60 (face-centered cubic K 3C 60, body-centered tetragonal K 4C 60, and body-centered cubic K 6C 60) are reported. From the temperature dependencies of the ESR intensity for these three phases, it is confirmed that the superconducting K 3C 60 phase is metallic, and that both of the non-superconducting K 4C 60 and K 6C 60 phases are semiconducting or insulating. The electronic properties of K x C 60 are discussed in comparison with those of Rb x C 60 and K x C 70.
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