Confinement effects in antiferromagnets

Article

关键词: LATTICE-GAS-MODEL;    THIN ISING FILMS;    INTERFACE LOCALIZATION TRANSITION;    ORDER-DISORDER TRANSITIONS;    SURFACE CRITICAL-BEHAVIOR;    FCC CRYSTAL-STRUCTURE;    CRITICAL-POINT SHIFTS;    PHASE-TRANSITIONS;    BINARY-ALLOYS;    COMPETING WALLS;   

DOI  :  10.1103/PhysRevB.62.1148

来源: SCIE

【 摘 要 】

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. Thr ground-slate 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 las 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.

【 授权许可】

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