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

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

References in corpus (6)

• Enhanced magnetocaloric effect in frustrated magnets
• Magnetocaloric effect in one-dimensional antiferromagnets
• Magnetocaloric effect in the frustrated square lattice J1-J2 model
• Magnetocaloric effect in two-dimensional spin-1/2 antiferromagnets
• Thermodynamic and magnetocaloric properties of geometrically frustrated Ising nanoclusters
• Phase diagrams of a 2D Ising spin-pseudospin model