Abstract
Temperature-dependent reflectivity spectra of a multiferroic hexagonal ${\text{YMnO}}_{3}$ single crystal were measured with polarized light in the ferroelectric phase. The phonon parameters for both $E\ensuremath{\parallel}c$ and $E\ensuremath{\perp}c$ polarizations are obtained by fitting the dielectric function to experimental data. Phonon assignment is done on the basis of lattice dynamics calculations. Phonon anomalies are found at the antiferromagnetic transition ${T}_{N}$. Mean Born effective charges are calculated from phonon fit parameters and discussed in the framework of the different mechanisms proposed for the origin of ferroelectricity in hexagonal multiferroic manganites.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
