Distribution of K ions in intermediate KC60

G. Faigel, G. Bortel, M. Tegze, L. Granasy, S. Pekker, G. Oszlanyi, O. Chauvet, G. Baumgartner, L. Forro, P. W. Stephens, G. Mihaly, A. Janossy

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23 Citations (Scopus)

Abstract

Intermediate KC60 formed from the homogeneous KC60 phase at 400 K is investigated by differential scanning calorimetry, x-ray diffraction, dc resistivity, electron spin resonance (ESR), and magnetic ac susceptibility. We show that in intermediate KC60 the C60 sublattice is continuous over large distances but the K ions separate into small K3C60 and K-free C60 regions. ESR shows a large volume fraction of superconducting K3C60. The K3C60 phase is finely distributed and the magnetic-field exclusion is small. K3C60 regions are compressed and K-free regions are expanded with respect to the corresponding bulk phases. The compression decreases the superconducting critical temperature (Tc) from 19 to 16 K. The expansion of the K-free C60 regions decreases the orientational ordering transition temperature (at 260 K) by 10 K.

Original languageEnglish
Pages (from-to)3199-3205
Number of pages7
JournalPhysical Review B
Volume52
Issue number5
DOIs
Publication statusPublished - Jan 1 1995

ASJC Scopus subject areas

  • Condensed Matter Physics

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