Confinement Effects in Antiferromagnets

Details Confinement Effects in Antiferromagnets Confinement Effects in Antiferromagnets

2000-04-11

arxiv.org/abs/cond-mat/0004160v1

Physics

Condensed Matter

Materials Science

10 pages, 8 figures, Accepted in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.62.1148

Phase equilibrium in confined Ising antiferromagnets was studied as a function of the coupling (v) and a magnetic field (h) at the surfaces, in the presence of an external field H. The ground state properties were calculated exactly for symmetric boundary conditions and nearest-neighbor interactions, and a full zero-temperature phase diagram in the plane v-h was obtained for films with symmetry-preserving surface orientations. The ground-state analysis was extended to the H-T plane using a cluster-variation free energy. The study of the finite-T properties (as a function of v and h) reveals the close interdependence between the surface and finite-size effects and, together with the ground-state phase diagram, provides an integral picture of the confinement in anisotropic antiferromagnets with surfaces that preserve the symmetry of the order parameter.

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