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.
Original language | English (US) |
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Pages (from-to) | 5599-5605 |
Number of pages | 7 |
Journal | Physical Review B |
Volume | 22 |
Issue number | 12 |
DOIs | |
State | Published - 1980 |
ASJC Scopus subject areas
- Condensed Matter Physics