PHONON PROPERTIES OF A MULTIFERROIC BiFeO3 IN CUBIC PHASE
نویسنده
چکیده
Multiferroic (MF) materials exhibit a highly coupled, spontaneous ferroelectric polarization and magnetization. Coupling between electrical and magnetic properties in multiferroic materials makes them a promising material for the design of multifunctional device applications, but also because of the interesting physics found in this class of materials. The role or absence of phonon softening in order to explain ferroelectric transition and the phonon modes symmetry in BiFeO3 are some important questions still needs to be answered. Very little is known about the behaviour of phonons in magnetoelectric multiferroics. The investigations of phonons have in the past played a crucial role in the understanding of classic ferroelectrics. Motivated to determine and understand the role of phonons in multiferroics, we have undertaken the theoretical investigation on the phonon properties of BiFeO3 in its cubic phase by applying lattice dynamical simulation method based on de Launey angular force (DAF) constant model. The calculated zone centre phonon frequencies agree well with available results. The phonon spectrum of BiFeO3 is calculated along the three symmetry directions. Some modes of BiFeO3 are coming out to be negative, representing the soft modes.
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