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Abstract: The coupling between localized spins and phonons can lead to shifts in thedielectric constant of insulating materials at magnetic ordering transitions.Studies on isostructural SeCuO3 ferromagnetic and TeCuO3 antiferromagneticillustrate how the q-dependent spin-spin correlation function couples to phononfrequencies leading to a shift in the dielectric constant. A model is discussedfor this spin-phonon coupling. The magnetodielectric coupling in multiferroicmaterials can be very large at a ferroelectric transition temperature. Thiscoupling is investigated in the recently identified multiferroic Ni3V2O8.



Author: G. Lawes, T. Kimura, C.M. Varma, M.A. Subramanian, R.J. Cava, A.P. Ramirez

Source: https://arxiv.org/



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