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arxiv: cond-mat/0110320 · v1 · submitted 2001-10-16 · ❄️ cond-mat.mtrl-sci · cond-mat.str-el

Ordered low-temperature structure in K4C60 detected by infrared spectroscopy

K. Kamaras (1) , G. Klupp (1) , D. B. Tanner (2) , A. F. Hebard (2) , N. M. Nemes (3) , J. E. Fischer (3) ((1) Research Institute for Solid State Physics , Optics , Budapest
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Hungary (2) University of Florida Gainesville FL USA (3) University of Pennsylvania Philadelphia PA USA)
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classification ❄️ cond-mat.mtrl-sci cond-mat.str-el
keywords anionsinfraredjahn-tellerk4c60phasestaticaboveappear
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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.

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