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Magnetocaloric Effect in Two-Dimensional Diluted Ising Model: Appearance of Frustrations in the Ground State

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Abstract

The magnetocaloric effect in a two-dimensional Ising model is considered for different ratios between parameters of inter-site repulsion of nonmagnetic impurities and exchange coupling. Classical Monte Carlo simulations on a square lattice show that in case of weak coupling and at sufficiently high concentrations of nonmagnetic impurities the long-range ferromagnetic ordering breaks down to give isolated spin clusters in the ground state of the system. This leads to appearance of a paramagnetic response in the system at the zero temperature and nonzero entropy of the ground state. The feasibility to detect frustration of ground state using data on the magnetic entropy variation is discussed.

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Funding

The work was supported within the Competitiveness Enhancement Program of the Ural Federal University (Russian Federation Government Act 211, agreement no. 02.A03.21.0006), by the Ministry of Education and Science, Russian Federation (project FEUZ-2020-0054), and by the Russian Foundation for Basic Research (research project no. 18-32-00837/18).

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Authors and Affiliations

  1. Ural Federal University Named after the First President of Russia B.N. Yeltsin, Yekaterinburg, Russia

    A. V. Shadrin, V. A. Ulitko & Yu. D. Panov

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  1. A. V. Shadrin
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  2. V. A. Ulitko
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  3. Yu. D. Panov
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Correspondence to A. V. Shadrin.

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The authors declare that they have no conflicts of interest.

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Translated by A. Kukharuk

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Shadrin, A.V., Ulitko, V.A. & Panov, Y.D. Magnetocaloric Effect in Two-Dimensional Diluted Ising Model: Appearance of Frustrations in the Ground State. Phys. Solid State 62, 1719–1724 (2020). https://doi.org/10.1134/S1063783420090267

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  • DOI: https://doi.org/10.1134/S1063783420090267

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