EVOLUTION EQUATION OF ELECTRIC POLARIZATION IN MULTIFERROICS PROPORTIONAL TO THE VECTOR PRODUCT OF CELL ION SPINS UNDER THE INFLUENCE OF THE HEISENBERG HAMILTONIAN
- Авторлар: Andreev P.A.1, Trukhanova M.I.1,2
-
Мекемелер:
- Lomonosov Moscow State University, Faculty of Physics
- Laboratory of Theoretical Physics, Institute for Problems of Safe Development of Nuclear Energy of the Russian Academy of Sciences
- Шығарылым: Том 166, № 5 (2024)
- Беттер: 665-678
- Бөлім: ORDER, DISORDER AND PHASE TRANSITIONS IN CONDENSED MATTER
- URL: https://journal-vniispk.ru/0044-4510/article/view/268675
- DOI: https://doi.org/10.31857/S0044451024110099
- ID: 268675
Дәйексөз келтіру
Аннотация
An evolution equation for polarization (electric dipole moment density) has been derived for type II multiferroics, where polarization is proportional to the vector product of cell ion spins. A regime is considered in which the main evolution mechanism is exchange Coulomb interaction, modeled by the Heisenberg Hamiltonian. The obtained polarization evolution equation contains spin density and nematic tensor density, which appears as an anticommutator of spins for particles with S = 1 and higher (for particles with spin S = 1/2 it degenerates into particle concentration). Also, to construct a closed model of spin and polarization evolution in multiferroics, equations for the above-mentioned physical quantities were obtained. The spin-current model is justified using the momentum balance equation and spin evolution equation, derived from the microscopic many-particle Pauli equation taking into account spin-orbit interaction. To analyze the mechanism of electric dipole moment formation proportional to the vector product of magnetic ion spins, the spin-current model was used, within which the relationship between the proportionality coefficient and the exchange integral was obtained. The mean-field approximation is used in the work, where the many-particle wave function of the ion system is approximated by the product of single-particle functions.
Авторлар туралы
P. Andreev
Lomonosov Moscow State University, Faculty of Physics
Email: trukhanova@physics.msu.ru
Ресей, 119991, Moscow
M. Trukhanova
Lomonosov Moscow State University, Faculty of Physics; Laboratory of Theoretical Physics, Institute for Problems of Safe Development of Nuclear Energy of the Russian Academy of Sciences
Хат алмасуға жауапты Автор.
Email: trukhanova@physics.msu.ru
Ресей, 119991, Moscow; 115191, Moscow
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