Magnetic field tuning of polaron losses in Fe doped BaTiO3 single crystals
Langue
en
Article de revue
Ce document a été publié dans
Journal of Physics: Condensed Matter. 2012, vol. 24, n° 40, p. 405901 (6 p.)
IOP Publishing
Résumé en anglais
Artificial tuning of dielectric parameters can result from interface conductivity in polycrystalline materials. In ferroelectric single crystals, it was already shown that ferroelectric domain walls can be the source of ...Lire la suite >
Artificial tuning of dielectric parameters can result from interface conductivity in polycrystalline materials. In ferroelectric single crystals, it was already shown that ferroelectric domain walls can be the source of such artificial coupling. We show here that low temperature dielectric losses can be tuned by a dc magnetic field. Since such losses were previously ascribed to polaron relaxation we suggest this results from the interaction of hopping polarons with the magnetic field. The fact that this losses alteration has no counterpart on the real part of the dielectric permittivity confirms that no interface is to be involved in this purely dynamical effect. The contribution of mobile charges hopping among Fe related centers was confirmed by ESR spectroscopy showing maximum intensity at ca T\sim40 K.< Réduire
Mots clés en anglais
Dielectrics
Polaron
Magnetism
BaTiO3
Iron
Single crystal
Origine
Importé de halUnités de recherche