Реферат: We investigate critical behavior of the Heisenberg model with competing exchange and single-ion crystalline anisotropy with parameter D. We reconstruct the complete D-T phase diagram using the joint density of states, which was calculated by the Wang-Landau algorithm. A hybrid approach involved entropy modeling with unsupervised machine learning methods is proposed for automatic identification of magnetic ordering phases and determination of bicritical point coordinates (Tbc, Dbc ). V-shaped phase coexistance boundaries, corresponding to competition between XY -like and Ising-like order were reveald for D ∼ Dc with three types of transitions: classic second-order transitions between paramagnetic and ordered phases, first-order transition line between XY and Ising phases and crossover from Ising to paramagnetic phase at non-zero external magnetic field. The proposed approach allows for the precise detection of phase boundaries and multicritical points.

Библиографическая ссылка: Khitrintseva V.V. , Druzev D.A. , Prudnikov P.V.
Phase diagrams of a magnet with competing types of anisotropy: Entropy modeling and machine learning
EPL. 2026. V.156. 46003 :1-7. DOI: 10.1209/0295-5075/ae9dae

Даты:

Поступила в редакцию:	27 мая 2026 г.
Принята к публикации:	24 авг. 2026 г.
Опубликована online:	30 сент. 2026 г.

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