2007/04/30 by R. Valdés Aguilar, Rolando Valdés Aguilar, A. B. Sushkov +6 · 7 citations
Materials Science · Physics and Astronomy · #Ferroelectric and Piezoelectric Materials #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.76.060404
published as Physical Review B 76 060404(R) (2007) · 4 pages, 3 figures
arxiv created 2007/07/24 · openalex publication_date 2007/08/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report the spectra of magnetically induced electric dipole absorption in Eu0.75Y0.25MnO3 from temperature-dependent far-infrared spectroscopy (10--250\phantom\rule0.3em0excm^\ensuremath-1). These spectra, which occur only in the e\ensuremath\Verta polarization, consist of two relatively narrow electromagnon features with onset at TFE=30\phantom\rule0.3em0exK and a broad absorption band that persists to temperatures well above TN=47\phantom\rule0.3em0exK. The observed excitations account for the step up of the static dielectric constant in the ferroelectric phase. The electromagnon at 80\phantom\rule0.3em0excm^\ensuremath-1 is observed to be strongly coupled to the nearby lowest optical phonon which transfers more than 1∕2 of its spectral weight to the magnon. We attribute the origin of the broad background absorption to the two-magnon-emission decay process of the phonon.