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XXV International Symposium Nanophysics and Nanoelectronics, Nizhny Novgorod, March 9-12, 2021
Phase transitions
Nontrivial ground state degeneracy of the spin–pseudospin model of a two-dimensional magnet near the frustration point
D. N. Yasinskaya, V. A. Ulitko, Yu. D. Panov Ural Federal University named after the First President of Russia B. N. Yeltsin, Yekaterinburg, Russia
Abstract:
The classical Monte Carlo method is used for the study of properties of the ground state and phase transitions of the spin-pseudospin model describing a two-dimensional Ising magnet with competing charge and spin interactions. This competition causes ground state degeneracy and frustration. It is shown that the ground state degeneracy is observed in the frustration area with nonzero probabilities of the formation of two different ordered states. Based on histogram analysis of Monte-Carlo data, the type of phase transitions is analyzed. It is found that first order phase transitions are observed near the frustration point, depending on the relationship between the spin $s$ = 1/2 and pseudospin $S$ = 1 interactions.
Keywords:
diluted ising magnet, frustration, Monte-Carlo method, ground state, phase transitions.
Received: 09.04.2021 Revised: 09.04.2021 Accepted: 19.04.2021
Citation:
D. N. Yasinskaya, V. A. Ulitko, Yu. D. Panov, “Nontrivial ground state degeneracy of the spin–pseudospin model of a two-dimensional magnet near the frustration point”, Fizika Tverdogo Tela, 63:9 (2021), 1350–1354; Phys. Solid State, 63:10 (2021), 1588–1592
Linking options:
https://www.mathnet.ru/eng/ftt8041 https://www.mathnet.ru/eng/ftt/v63/i9/p1350
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Abstract page: | 46 | Full-text PDF : | 17 |
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