Phase diagram of a ferromagnetic semiconductor. The origin of superparamagnetism
Strongly Correlated Electrons
2024-01-31 v2 Materials Science
Abstract
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.
Keywords
Cite
@article{arxiv.2307.16538,
title = {Phase diagram of a ferromagnetic semiconductor. The origin of superparamagnetism},
author = {N. A. Bogoslovskiy and P. V. Petrov and N. S. Averkiev},
journal= {arXiv preprint arXiv:2307.16538},
year = {2024}
}