Fizika Nizkikh Temperatur: Volume 45, Number 1 (January 2019), p. 90-103    ( to contents , go back )

Spin-phonon interaction in transition-metal difluoride antiferromagnets: Theory and experiment

M.G. Cottam

Department of Physics and Astronomy, University of Western Ontario, London, Ontario, Canada N6A 3K7
E-mail: cottam@uwo.ca

D.J. Lockwood

Measurement Science and Standards, National Research Council, Ottawa, Ontario, Canada K1A 0R6
E-mail: david.lockwood@nrc-cnrc.gc.ca

Received July 26, 2018, published online November 26, 2018

Abstract

An overall comparative study is made of the spin-phonon interactions in several rutile-structure transition-metal difluorides, specifically FeF2, MnF2, NiF2, and CoF2, in terms of recent developments obtained experimentally using inelastic light scattering spectroscopy and theoretically using a modified mean-field approach to estimate spin-pair correlation functions. New experimental data are presented here and interpreted within an extend-ed and comprehensive theoretical treatment to yield estimates for the spin-phonon coupling coefficients and the relative magnitudes of the magneto-optical coupling coefficients.

Key words: antiferromagnets, spin-phonon coupling, rutile structure, magneto-optical coupling, Raman spectroscopy.

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