Magnetic-field dependence of the phosphorus nuclear spin-relaxation rate in the quasi-two-dimensional XY antiferromagnet BaNi2(PO4)2

The phosphorus nuclear spin-lattice relaxation rate 1/T1 has been measured in the quasi-two-dimensional XY antiferromagnet BaNi2(PO4)2. The divergence observed just above the ordering temperature TN ≂ 23.6 K is analyzed within the context of the Kosterlitz–Thouless transition. For a magnetic field H...

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Bibliographic Details
Published in:Journal of applied physics 1991-04, Vol.69 (8), p.6228-6230
Main Authors: GAVEAU, P, BOUCHER, J. P, REGNAULT, L. P, HENRY, Y
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Nuclear magnetic resonance and relaxation
Physics
Relaxation effects
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Summary:The phosphorus nuclear spin-lattice relaxation rate 1/T1 has been measured in the quasi-two-dimensional XY antiferromagnet BaNi2(PO4)2. The divergence observed just above the ordering temperature TN ≂ 23.6 K is analyzed within the context of the Kosterlitz–Thouless transition. For a magnetic field H perpendicular to the XY plane, the data presented here agree well with a recent model of freely moving vortices. The field dependence observed for H parallel suggests a drastic slowing down of the vortex velocity in that case.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.348816