Magnetopolaron states of a spin-correlated antiferromagnet in the neighborhood of the spin-glass transition |
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Authors: | V V Val’kov D M Dzebisashvili |
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Institution: | (1) L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, 660036 Krasnoyarsk, Russia;(2) Krasnoyarsk State University, 660000 Krasnoyarsk, Russia;(3) Krasnoyarsk State Technical University, 660036 Krasnoyarsk, Russia |
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Abstract: | The problem of the spectrum of magnetopolaron states of a strongly correlated conducting canted antiferromagnet is solved.
The approach used to study the spectrum is based on an atomic representation and a diagram technique for Hubbard operators.
This approach makes it possible to include strong intra-ion interactions in a first-principles way, and to obtain the dispersion
equation for the magnetopolaron spectrum for arbitrary values of the magnitude of the spin, temperature, and magnetic field.
In the vicinity of the spin-flip transition an analytic expression is obtained for the spectrum of magnetopolaron states that
goes beyond the framework of the quasiclassical approximation.
Fiz. Tverd. Tela (St. Petersburg) 40, 310–314 (February 1998) |
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