About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Publication
Physical Review B
Paper
Commensurate Peierls transition in a quasi-one-dimensional compound: The bromide salt of tetrathiafulvalene (TTF)
Abstract
The x-ray crystal structure of the bromide salt of tetrathiafulvalene (TTF)-Br0.79 shows incommensurate cation and anion sublattices, with a static modulation of each stack at the periodicity of the opposing stack. If the on-site Coulomb interactions were very small compared with the bandwidth, this modulation would induce an energy gap at twice the Fermi wave vector and hence a commensurate Peierls transition would be possible. If the Coulomb interactions were very large, (TTF)-Brx would be a room-temperature semiconductor. Transport, magnetic, thermal, and optical measurements are presented, which indicate that the Coulomb interactions are not very large compared with the bandwidth, estimated at 4t∼1.1 eV. Hence, the system can be viewed as undergoing a commensurate Peierls transition at ∼ 170 K. © 1980 The American Physical Society.