Publication
Physical Review Letters
Paper

Anomalous nature of neutral-to-ionic phase transition in tetrathiafulvalene-chloranil

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Abstract

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.

Date

14 Dec 1981

Publication

Physical Review Letters