Importance of In-Plane Anisotropy in the Quasi-Two-Dimensional AntiferromagnetBaNi2V2O8

Autor:	Peter Schweiss, Kai Grube, Hilbert von Löhneysen, S. Drobnik, P. Popovich, Peter Adelmann, Christoph Meingast, Th. Wolf, W. Knafo
Rok vydání:	2007
Předmět:	Physics Magnetization Magnetic anisotropy Condensed matter physics General Physics and Astronomy Antiferromagnetism Magnetostriction Anisotropy Thermal expansion Phase diagram Magnetic field
Zdroj:	Physical Review Letters. 99
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.99.137206
Popis:	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 micro(o)H* approximately 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.
Databáze:	OpenAIRE
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