Pressure and light effects on the phase transition of deuterated Cu(2,5‐dimethyl‐dicyanoquinonediimine)2
| Autor: | H. Schmitt, D. Gómez, J.U. von Schütz, H.C. Wolf, H. Wachtel |
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| Rok vydání: | 1996 |
| Předmět: |
Phase transition
Condensed matter physics Chemistry Transition temperature Analytical chemistry General Physics and Astronomy Conductivity Atmospheric temperature range law.invention law Electrical resistivity and conductivity Physical and Theoretical Chemistry Electron paramagnetic resonance Charge density wave Phase diagram |
| Zdroj: | The Journal of Chemical Physics. 104:4198-4203 |
| ISSN: | 1089-7690 0021-9606 |
| Popis: | The deuterated dicyanoquinonediimine salt Cu(2‐CD3,5‐CD3‐DCNQI)2, (d6), a highly conductive organic metal, exhibits a phase transition from the metallic to the insulating state at Tc≊60 K. In a wide temperature range we observe an anticoincidence of high conductivity and electron spin resonance (ESR). These experiments were performed simultaneously in our ESR apparatus equipped for application of He pressure up to 200 bar. Near Tc there is a coexistence of conducting (ESR‐silent) and insulating (ESR‐detectable) domains. This correlation of ESR and conductivity σ points to a percolation limited conductivity. Upper and lower limits of the size of the domains are given. Light shifts Tc to lower temperatures, pressure to higher ones. This could be due to shrinking of the lattice which induces the phase transition when critical structural parameters are approached. This is most probably explained by a simultaneous development of a charge density wave (CDW) and a spin pairing within the DCNQI stack together wit... |
| Databáze: | OpenAIRE |
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