Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.88: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Temperature behavior of specific heat of hexagonal spin ice models with different interaction radius — Yuriy Shevchenko^1,2, •Aleksandr Makarov^1,2, Petr Andriushchenko^1,2, and Konstantin Nefedev^1,2 — ¹Department of Computer Systems, School of Natural Sciences, Far Eastern Federal University, Vladivostok, Russian Federation — ²Institute of Applied Mathematics of Far Eastern Branch, Russian Academy of Science, 7 Radio Str, Vladivostok, Russian Federation

By Wang-Landau method the problems of temperature behavior of specific heat were solved for hexagonal lattice models with dipole short-range, as well as long-range interaction and free boundary conditions. We observe an anomalous behavior of specific heat for such lattices. It is established that systems of a finite number of Ising spins with long-range dipole interactions can have unusual thermodynamic properties that are characterized by the presence of several peaks of the specific heat in the absence of an external magnetic field. There is no phase transition in the model with the nearest-neighbor interaction on a hexagonal lattice, while the temperature behavior of the specific heat exhibits a singularity in the same model for long-range interaction.