Spin-Peierls transitions in magnetic donor-acceptor compounds of tetrathiafulvalene (TTF) with bisdithiolene metal complexes
| Autor: | James William Bray, G. D. Watkins, Israel S. Jacobs, Jill C. Bonner, H. R. Hart, J. S. Kasper, Leonard V. Interrante, Daniel E. Prober |
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| Rok vydání: | 1976 |
| Předmět: |
Physics
Condensed matter physics Transition temperature Order (ring theory) Magnetic susceptibility law.invention chemistry.chemical_compound chemistry law Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Singlet state Ground state Electron paramagnetic resonance Tetrathiafulvalene |
| Zdroj: | Physical Review B. 14:3036-3051 |
| ISSN: | 0556-2805 |
| DOI: | 10.1103/physrevb.14.3036 |
| Popis: | The spin-Peierls transition is considered as a progressive spin-lattice dimerization occurring below a transition temperature in a system of one-dimensional antiferromagnetic Heisenberg chains. In the simplest theories, the transition is second order and the ground state is a singlet with a magnetic gap. The historical origins and theoretical development of the concept are examined. Magnetic susceptibility and EPR measurements on the $\ensuremath{\pi}$-donor-acceptor compounds TTF\ifmmode\cdot\else\textperiodcentered\fi{}$M{S}_{4}{C}_{4}{(\mathrm{C}{F}_{3})}_{4}$ ($M=\mathrm{Cu}, \mathrm{Au}$; TTF is tetrathiafulvalene) are reported. These compounds exhibit clearly the characteristics of the spin-Peierls transition in reasonably good agreement with a mean-field theory. The susceptibility of each compound has a broad maximum near 50 K, while the transitions occur at 12 and 2.1 K for $M=\mathrm{Cu} \mathrm{and} \mathrm{Au}$, respectively. EPR linewidth observations over a broad temperature range are examined. Areas for further experimental and theoretical work are indicated, and a critical comparison is made of related observations on other materials. |
| Databáze: | OpenAIRE |
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