Soft Phonon in an Antiferromagnetic and Ferroelectric Sr0.5Ba0.5Mn0.97Ti0.03O3

T. Suzuki; D. Okuyama; T. Fukuda; A. Q. R. Baron; T. Arima; Y. Tokura; Y. Taguchi

doi:10.18957/rr.4.1.36

Section A

Soft Phonon in an Antiferromagnetic and Ferroelectric Sr_0.5Ba_0.5Mn_0.97Ti_0.03O₃

T. Suzuki, D. Okuyama, T. Fukuda, A. Q. R. Baron, T. Arima, Y. Tokura, Y. Taguchi

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Keywords: inelastic x-ray scattering, multiferroics, phonon dynamics, 2012A1243, BL35XU

JOURNAL OPEN ACCESS

2016 Volume 4 Issue 1 Pages 36-40

DOI https://doi.org/10.18957/rr.4.1.36

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Abstract

Phonon dynamics of multiferroic Sr_0.5Ba_0.5Mn_0.97Ti_0.03O₃ was investigated by means of inelastic x-rays cattering. We found that the mode which corresponds to the soft mode in the paraelectric materials becomes prominent below the antiferromagnetic phase transition temperature. On the other hand, the energies of transverse optical phonon modes remain almost constant upon the magnetic ordering. This suggests that dynamical fluctuation of electric dipole moments is crucial for a large spin-phonon coupling.

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