Ordered low-temperature structure in K4C60 detected by infrared spectroscopy

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

doi:10.1103/PhysRevB.65.052103

Ordered low-temperature structure in K4C60 detected by infrared spectroscopy

Materials Science 2009-11-07 v1 Strongly Correlated Electrons

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

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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 (C60)4- anions. The T1u(4) mode changes into the 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.

Keywords

crystal growth and phase transitions phase transitions

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@article{arxiv.cond-mat/0110320,
  title  = {Ordered low-temperature structure in K4C60 detected by infrared spectroscopy},
  author = {K. Kamaras and G. Klupp and D. B. Tanner and A. F. Hebard and N. M. Nemes and J. E. Fischer},
  journal= {arXiv preprint arXiv:cond-mat/0110320},
  year   = {2009}
}

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4 pages, 2 figures submitted to Phys. Rev. B

Ordered low-temperature structure in K4C60 detected by infrared spectroscopy

Abstract

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