Spin frustration and magnetic ordering in the S= 12 molecular antiferromagnet fcc-Cs3 C60

Y. Kasahara, Y. Takeuchi, T. Itou, R. H. Zadik, Y. Takabayashi, A. Y. Ganin, D. Arčon, M. J. Rosseinsky, K. Prassides, Y. Iwasa

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11 Citations (Scopus)

Abstract

We have investigated the low-temperature magnetic state of face-centered-cubic (fcc) Cs3C60, a Mott insulator and the first molecular analog of a geometrically frustrated Heisenberg fcc antiferromagnet with S=1/2 spins. Specific heat studies reveal the presence of both long-range antiferromagnetic ordering and a magnetically disordered state below TN=2.2 K, which is in agreement with local probe experiments. These results together with the strongly suppressed TN are unexpected for conventional atom-based fcc antiferromagnets, implying that the fulleride molecular degrees of freedom give rise to the unique magnetic ground state.

Original languageEnglish
Article number014413
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number1
DOIs
Publication statusPublished - 2014 Jul 14

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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