Neutron Scattering Measurements in RbMnF3: A Test of Spin-Wave-Region Theories at Low Temperatures and Critical Behavior Near TN

Thumbnail Image
Penn collection
Department of Physics Papers
Degree type
Physical Sciences and Mathematics
Grant number
Copyright date
Related resources
Bykovetz, N.
Hoser, A.
Klein, J.
Lin, C. L.
Seehra, M. S.

With the discovery of magnetic ordering in RbMnF3, this unique antiferromagnetic system was recognized as a prime case for a test of conventional spin-wave theory (CSWT) because of its negligibly small anisotropy and its simple, cubic structure. CSWT predicts a simple T2 power-law fall-off of the sublattice magnetization. Yet to this day, no stringent tests have been made of this prediction. Seiden [(Phys. Lett. 28 A, 239 (1968)] deduced a T3 low-temperature behavior on the basis of antiferromagnetic resonance measurements, concluding that CSWT was not supported. We have recently carried out neutron scattering measurements of both single-crystal and powdered samples of RbMnF3 in order to test for CSWT, Seiden’s result, and two other more recent semiempirical spin-wave schemes, and we present an analysis of the results. Measurements in the critical regime gave values of the critical exponent β and of TN that are in agreement with previous measurements.

Date Range for Data Collection (Start Date)
Date Range for Data Collection (End Date)
Digital Object Identifier
Series name and number
Publication date
Journal title
Volume number
Issue number
Publisher DOI
Journal Issue
N. Bykovetz, A. Hoser, J. Klein, C. L. Lin, and M. S. Seehra. (2012). Neutron scattering measurements in RbMnF3: A test of spin-wave-region theories at low temperatures and critical behavior near TN. Journal of Applied Physics, 111(7), 07E145. doi: © 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 111, 07E145 (2012) and may be found at
Recommended citation