Nonlinear excitations in CsNiF3 in magnetic fields perpendicular to the easy plane

Details Nonlinear excitations in CsNiF3 in magnetic fields perpendicular to the easy plane Nonlinear excitations in CsNiF3 in magnetic fields perpendicular to the easy plane

2003-09-12

arxiv.org/abs/cond-mat/0309310v2

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 5 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.69.184403

Experimental and numerical studies of the magnetic field dependence of the specific heat and magnetization of single crystals of CsNiF3 have been performed at 2.4 K, 2.9 K, and 4.2 K in magnetic fields up to 9 T oriented perpendicular to the easy plane. The experimental results confirm the presence of the theoretically predicted double peak structure in the specific heat arising from the formation of nonlinear spin modes. The demagnetizing effects are found to be negligible, and the overall agreement between the data and numerical predictions is better than reported for the case when the magnetic field was oriented in the easy plane. Demagnetizing effects might play a role in generating the difference observed between theory and experiment in previous work analyzing the excess specific heat using the sine-Gordon model.

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