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Phys. Rev. B 36, 3884–3887 (1987)

Infrared molecular-vibration spectra of tetrathiafulvalene-chloranil crystal at low temperature and high pressure

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K. Takaoka, Y. Kaneko*, H. Okamoto, Y. Tokura†, and T. Koda
Department of Applied Physics, University of Tokyo, Tokyo 113, Japan

T. Mitani
Institute for Molecular Science, Okazaki 444, Japan

G. Saito
Institute for Solid State Physics, University of Tokyo, Tokyo 106, Japan

Received 10 February 1987; published in the issue dated 1 September 1987

Temperature (T) variations of the infrared molecular-vibration spectra of tetrathiafulvalene-chloranil (TTF-CA) crystalline powders have been measured at variable pressure (P). From the observed behavior of the spectra as a function of T and P, it is concluded that both quasi-ionic and quasineutral molecules coexist in an intermediate range of T and P, until the crystal undergoes a phase transition to the dimerized ionic phase at Tc which depends on P. These results are discussed in terms of a P-T phase diagram of TTF-CA crystal.

© 1987 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.36.3884
DOI:
10.1103/PhysRevB.36.3884
PACS:

*Present address: High-Technology Laboratories, Kawasaki Steel Corp., Chiba 260, Japan.

†Present Address: Physics Department, University of Tokyo, Tokyo 113, Japan.

 
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