Dresden 2011 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.49: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Spin-Phonon Excitations in Multiferroics — •Safa Golrokh Bahoosh1, Steffen Trimper2, and Julia Wesselinowa3 — 1Max Planck Institute of Microstructure Physics,Halle,Germany — 2Institute of Physics, Martin-Luther-University,Halle,Germany — 3University of Sofia, Department of Physics,Sofia,Bulgaria
The influence of phonons on multiferroic systems are studied using a Green's function technique. The calculations are performed on the basis of considering nearest and the next nearest neighbor interaction in the Heisenberg model which favors the occurrence of helical structures in the magnetic system. The ferroelectric subsystem is characterized by the Ising model in a transverse field and is described by pseudo-spin-operators. Taking into account anharmonic phonon couplings, spin-phonon interaction as well as pseudo-spin-phonon-interaction we calculate the temperature dependent spectrum of the coupled system. The elementary excitations determine the macroscopic properties of the system like the magnetization and the polarization. The results are compared with experimental observations.