Journal
LOW TEMPERATURE PHYSICS
Volume 28, Issue 7, Pages 505-509Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1496657
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The temperature dependence of the four Raman-active phonons in NiF2 is investigated at temperatures above and below the antiferromagnetic ordering temperature of T-N=73 K. All four modes exhibit distinct anomalies in their intensities and frequencies near T-N due to spin-phonon coupling. The phonon linewidths also exhibit weak anomalies. From the temperature dependences of the phonon frequencies, estimates are made of the spin-phonon coupling coefficients. The B-1g phonon exhibits anomalous mode softening with decreasing temperature from 300 K to T-N. (C) 2002 American Institute of Physics.
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