Physics of the Solid State
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The mean field approximation for a system of triplet bosons in nickelates
Ryumshin V. S.
1, Nuzhin S. V.
1, Panov Y. D.
1, Moskvin A. S.
1,2
1Institute of Natural Sciences, Ural Federal University after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia
2M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
2M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Email: vitaliy.riumshin@urfu.ru, nuzhin.stepan@urfu.ru, yuri.panov@urfu.ru, alexander.moskvin@urfu.ru
Rare-earth orthonickelates RNiO3 are Jahn-Teller magnets, unstable with respect to the anti-Jahn-Teller disproportionation reaction with the formation of a system equivalent to a system of effective spin-triplet composite bosons moving in a non-magnetic lattice. Within the framework of the two-sublattice approximation, we have developed a mean field theory for a model nickelate with competition between phases of charge ordering, an antiferromagnetic insulator and a spin-triplet superconductor, and constructed phase diagrams taking into account phase separation. Keywords: rare earth orthonickelates, mean field approximation, phase separation.
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