Importance of In-Plane Anisotropy in the Quasi Two-Dimensional Antiferromagnet BaNi$_{2}$V$_{2}$O$_{8}$

W. Knafo; C. Meingast; K. Grube; S. Drobnik; P. Popovich; P. Schweiss; P. Adelmann; Th. Wolf; H. V. Löhneysen

doi:10.1103/PhysRevLett.99.137206

paper

Importance of In-Plane Anisotropy in the Quasi Two-Dimensional Antiferromagnet BaNi $_{2}$ V $_{2}$ O $_{8}$

arXiv:cond-mat/0612357 · doi:10.1103/PhysRevLett.99.137206

Abstract

The phase diagram of the quasi two-dimensional antiferromagnet BaNi $_{2}$ V $_{2}$ O $_{8}$ is studied by specific heat, thermal expansion, magnetostriction, and magnetization for magnetic fields applied perpendicular to $c$ . At $μ_{0} H^{*} ≃ 1.5$ T, a crossover to a high-field state, where $T_{N} (H)$ increases linearly, arises from a competition of intrinsic and field-induced in-plane anisotropies. The pressure dependences of $T_{N}$ and $H^{*}$ are interpreted using the picture of a pressure-induced in-plane anisotropy. Even at zero field and ambient pressure, in-plane anisotropy cannot be neglected, which implies deviations from pure Berezinskii-Kosterlitz-Thouless behavior.

arXiv comment4 pages, 4 figures

References in corpus (2)

Quantum Monte Carlo study of S=1/2 weakly-anisotropic antiferromagnets on the square lattice
Thermal expansion of the quasi two-dimensional magnetic layered compound BaNi $_{2}$ V $_{2}$ O $_{8}$ under magnetic fields along c-axis

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Importance of In-Plane Anisotropy in the Quasi Two-Dimensional Antiferromagnet BaNi2​V2​O8​

Abstract

References in corpus (2)

Cited by in corpus (12)

Importance of In-Plane Anisotropy in the Quasi Two-Dimensional Antiferromagnet BaNi $_{2}$ V $_{2}$ O $_{8}$