Effect of strong electron correlations and electron-lattice interaction on the ordering of electron orbitals |
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Authors: | S S Aplesnin and A I Moskvin |
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Institution: | 1.Reshetnev Siberian State Aerospace University,Krasnoyarsk,Russia |
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Abstract: | The interactions between electrons in degenerate orbitals and between electrons and the lattice degrees of freedom have been
treated by the Monte Carlo method taking into account the anharmonicity of ionic vibrations in the framework of the phenomenological
model. The existence regions of the ferromagnetic and antiferromagnetic orbital orders have been found. Two critical temperatures
have been determined at which the long-range orbital order disappears and the distribution of electrons over the orbitals
becomes uniform. The correlation between the orbital ordering types and the thermal expansion coefficient has been established.
It has been found that an increase in anharmonicity leads to the stabilization of the antiferromagnetic orbital ordering. |
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