NMR Studies on Orientational Ordering Phase Transition in Na2CsC60

Takahito Saito, Yutaka Maniwa, Hitoshi Oda, Kiyoshi Kume, Mayumi Kosaka, Ichiro Hirosawa, Katsumi Tanigaki

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11 Citations (Scopus)


Sodium-containing alkali metal fullende, Na2CsC60, was studied by 13C and 23Na NMR below and above the face-centered cubic (fcc) to simple cubic (sc) phase transition temperature, Tm. It is shown that the molecules rotate faster than the rotational correlation time of 1.6 × 10−5 sec above ∼ 140 K and 2.4 × 10−9 sec around 300 K. Using 23Na NMR spectra broadened by the second-order quadrupole interaction, the electric field gradient at Na sites, e2qQ/h, was estimated to be 940±20 kHz and less than 0.1 kHz below and above Tm, respectively. The detailed analysis suggests that Na atoms in sc phase have a covalent character with molecules. It is also suggested that Na2CsC60 is the first metallic plastic crystal.

Original languageEnglish
Pages (from-to)4513-4517
Number of pages5
Journaljournal of the physical society of japan
Issue number12
Publication statusPublished - 1995 Dec
Externally publishedYes


  • C
  • NMR
  • alkali metal fullerides
  • fullerene
  • phase transition
  • plastic crystal
  • superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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