Low Temperature Physics: 28, 505 (2002); https://doi.org/10.1063/1.1496657 (5 pages)
Физика Низких Температур: Том 28, Выпуск 7 (Июль 2002), c. 709-715    ( к оглавлению , назад )

Spin-phonon interaction and mode softening in NiF2

D. J. Lockwood

Institute for Microstructural Sciences, National Research Council, Ottawa, ON KIA OR6
E-mail: David.Lockwood@nrc.ca

Received October 29, 2001

Аннотация

The temperature dependence of the four Raman-active phonons in NiF2 has been investigated at temperatures above and below the antiferromagnetic ordering temperature of TN=73 K. All four modes exhibit distinct anomalies in their intensities and frequencies near TN 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 B1g phonon exhibits anomalous mode softening with decreasing temperature from 300 K to TN .

PACS:
78.30.Hv - Other nonmetallic inorganics
75.50.Ee - Antiferromagnetics
63.20.Dj - Phonon states and bands, normal modes, and phonon dispersion
63.20.Kr - Phonon-electron and phonon-phonon interactions