Phase diagram of a ferromagnetic semiconductor. The origin of superparamagnetism
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866911767163043840 |
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| author | Bogoslovskiy, N. A. Petrov, P. V. Averkiev, N. S. |
| author_facet | Bogoslovskiy, N. A. Petrov, P. V. Averkiev, N. S. |
| contents | We study the theoretical model of a ferromagnetic semiconductor as a system of randomly distributed Ising spins with a long-range exchange interaction. Using the density-of-states approach, we analytically obtain the magnetic susceptibility and heat capacity over a wide range of temperatures and magnetic fields. It is shown that the finite system of spins in magnetic field less than a certain critical field is in a superparamagnetic state due to thermodynamic fluctuations. The complex phase structure of a ferromagnetic semiconductor is discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_16538 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Phase diagram of a ferromagnetic semiconductor. The origin of superparamagnetism Bogoslovskiy, N. A. Petrov, P. V. Averkiev, N. S. Strongly Correlated Electrons Materials Science We study the theoretical model of a ferromagnetic semiconductor as a system of randomly distributed Ising spins with a long-range exchange interaction. Using the density-of-states approach, we analytically obtain the magnetic susceptibility and heat capacity over a wide range of temperatures and magnetic fields. It is shown that the finite system of spins in magnetic field less than a certain critical field is in a superparamagnetic state due to thermodynamic fluctuations. The complex phase structure of a ferromagnetic semiconductor is discussed. |
| title | Phase diagram of a ferromagnetic semiconductor. The origin of superparamagnetism |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2307.16538 |