Anomalous Nature of Neutral-to-Ionic Phase Transition in Tetrathiafulvalene-Chloranil
- 14 December 1981
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 47 (24) , 1747-1750
- https://doi.org/10.1103/physrevlett.47.1747
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.Keywords
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