Title :
Spin and lattice vibrations of CaMn7O12 in the THz range
Author :
Kadlec, Filip ; Goian, Veronica ; Kadlec, Christelle ; Kempa, Martin ; Rols, Stephane ; Taylor, James ; Orlita, Milan ; Kamba, S.
Author_Institution :
Inst. of Phys., Prague, Czech Republic
Abstract :
We studied meV-range excitations in the CaMn7O12 multiferroic which exhibits a high ferroelectric polarization. In infrared, THz and neutron scattering spectra, we observed spin waves far above the Néel temperature. We denote these as paraelectromagnons and explain their presence by strong short-range magnetic correlations.
Keywords :
calcium compounds; ferroelectric materials; infrared spectra; lattice dynamics; manganese compounds; multiferroics; neutron spectra; terahertz wave spectra; CaMn7O12; Néel temperature; THz range; THz scattering spectra; high ferroelectric polarization; infrared scattering spectra; lattice vibrations; meV-range excitations; neutron scattering spectra; paraelectromagnons; short-range magnetic correlations; spin vibrations; Extraterrestrial measurements; Magnetic domains; Magnetic hysteresis; Magnetoelectric effects; Magnetostriction; Neutron spin echo; Temperature measurement;
Conference_Titel :
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on
Conference_Location :
Tucson, AZ
DOI :
10.1109/IRMMW-THz.2014.6956339
