Ordered low-temperature structure in K4C60 detected by infrared spectroscopy

K. Kamarás, G. Klupp, D. B. Tanner, A. F. Hebard, N. M. Nemes, J. E. Fischer

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Infrared spectra of a K4C60 single-phase thin film have been measured between room temperature and 20 K. At low temperatures, the two high-frequency T1u modes appear as triplets, indicating a static D2h crystal-field stabilized Jahn-Teller distortion of the C604- anions. The T1u(4) mode changes into a known doublet above 250 K, a pattern which could have three origins: a dynamic Jahn-Teller effect, static disorder between "staggered" anions, or a phase transition from an orientationally ordered phase to one where molecular motion is significant.

Original languageEnglish
Article number052103
Pages (from-to)521031-521034
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number5
Publication statusPublished - Feb 1 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Kamarás, K., Klupp, G., Tanner, D. B., Hebard, A. F., Nemes, N. M., & Fischer, J. E. (2002). Ordered low-temperature structure in K4C60 detected by infrared spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 65(5), 521031-521034. [052103].