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Phys. Rev. Lett. 47, 1747 - 1750 (1981)

Anomalous Nature of Neutral-to-Ionic Phase Transition in Tetrathiafulvalene-Chloranil

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J. B. Torrance, A. Girlando *, J. J. Mayerle, J. I. Crowley, V. Y. Lee, and P. Batail †
IBM Research Laboratory, San Jose, California 95193

S. J. LaPlaca
IBM Watson Research Center, Yorktown Heights, New York 10598

Received 23 June 1981

A phase transition starting at 84 K and indicated by a marked color change of the sample has been found in the organic insulator tetrathiafulvalene-chloranil. Optical, infrared, and Raman measurements indicate that this is a reversible transition from a nominally neutral (N) solid to a nominally ionic (I) salt. Surprisingly, the N-I transition is not first order, but occurs over a broad temperature region (∼30 K), in which there is a coexistence of N and I molecules.


©1981 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.47.1747
DOI: 10.1103/PhysRevLett.47.1747
PACS: 64.70.Kb, 78.30.Jw, 72.80.Le, 61.50.Lt

* Permanent address: University of Padova, I-35100 Padova, Italy.
† Permanent address: Laboratoire de Cristallochimie, Université de Rennes, F-35042 Rennes, France.

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