Influence of the interaction of polymeric chains on thermal transitions of Jahn—Teller exchange clusters in compounds of "breathing" crystal family
- Authors: Morozov V.A.1,2, Sagdeev R.Z.1,2
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Affiliations:
- International Tomography Center Institute, Siberian Branch of the Russian Academy of Sciences
- Novosibirsk State University
- Issue: Vol 66, No 2 (2017)
- Pages: 201-207
- Section: Full Articles
- URL: https://journals.rcsi.science/1066-5285/article/view/239958
- DOI: https://doi.org/10.1007/s11172-017-1720-0
- ID: 239958
Cite item
Abstract
Based on the method of random field distribution functions in Ising magnets, for the first time a theoretical description of thermal transitions in Jahn—Teller exchange clusters is suggested, which takes into account the interactions of polymeric chains in "breathing" crystal compounds. It was shown that the inclusion of this interaction can lead to both an intensification of spin-crossover type cooperative transitions in exchange clusters and their deceleration. The approach in question is generalized to include non-Jahn—Teller metal impurities in "breathing" crystals, which suppress cooperative effects in thermal transitions of Jahn—Teller exchange clusters. The obtained results qualitatively reproduce the temperature dependencies of magnetic properties of solid solutions Cu1—xNix(hfac)2LR (hfac is hexafluoroacetylacetonate anion, ligand LR is nitronyl nitroxide radical with pyrazole substituent at the second position of the imidazoline ring) when R = Et.
About the authors
V. A. Morozov
International Tomography Center Institute, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University
Author for correspondence.
Email: moroz@tomo.nsc.ru
Russian Federation, 3a ul. Institutskaya, Novosibirsk, 630090; 2 ul. Pirogova, Novosibirsk, 630090
R. Z. Sagdeev
International Tomography Center Institute, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University
Email: moroz@tomo.nsc.ru
Russian Federation, 3a ul. Institutskaya, Novosibirsk, 630090; 2 ul. Pirogova, Novosibirsk, 630090