Abstract
This paper studies the effect of orbital ordering of the electron density on the electrical properties of transition metal compounds including electron-deformation [strain] interaction. The electrical conductivity was calculated on the basis of the Kubo equation. It is shown that in a certain temperature region, orbital ordering is realized in the electron subsystem. The destruction of the ordered state can take place by a I or II order phase transition as a function of the amount of electron-deformation interaction. There is a finite jump in the electrical conductivity function at the point of disorder. The activation energy in the ordered state is greater than in the disordered state. The results of the calculations coincide with the experimental data on the electrical resistance of compounds with a spinel and perovskite structure containing Jahn-Teller ions.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 31–36, December, 1986.
The authors express their gratitude to I. Ya. Kanovskii for his valuable discussions on the obtained results.
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Muntyanu, R.P., Nitsovich, M.V. & Severova, T.B. Electrical properties of orbitally oriented crystals allowing for electron-deformation interaction. Soviet Physics Journal 29, 978–982 (1986). https://doi.org/10.1007/BF00895998
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DOI: https://doi.org/10.1007/BF00895998