Abstract
We report on a novel spin-lattice phase transition in an ionic mixed-stack charge-transfer (CT) compound of (BEDO-TTF)(Cl2TCNQ). We found that the rotational modes for rigid-body displacements of molecules afforded an appreciable quantitative variation in the exchange interactions along the mixed stacks, which resulted in the symmetry-invariant first-order magneto-lattice phase transition at around 110K. It was found in the electron paramagnetic resonance (EPR) spectra that the low-temperature strongly interacting spin phase was followed by a magnetic order at 16K. We discuss the origin of the transition at 110K in terms of the competition of free energy between the respective spin states. We also present neutral-ionic (NI) phase transition in the isomorphous compound of (BEDT-TTF)(ClMeTCNQ) under pressure.
| Original language | English |
|---|---|
| Pages (from-to) | 623-625 |
| Number of pages | 3 |
| Journal | Synthetic Metals |
| Volume | 133-134 |
| DOIs | |
| Publication status | Published - 2003 Mar 13 |
| Externally published | Yes |
| Event | ISCOM 2001 - Rusutsu, Hokkaido, Japan Duration: 2001 Sep 10 → 2001 Sep 14 |
Keywords
- Mixed-stack complex
- Neutral-ionic transition BEDT-TTF
- Spin-lattice transition
- TCNQ derivative
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry