Magnetic field tuning of polaron losses in Fe doped BaTiO3 single crystals
Language
en
Article de revue
This item was published in
Journal of Physics: Condensed Matter. 2012, vol. 24, n° 40, p. 405901 (6 p.)
IOP Publishing
English Abstract
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 ...Read more >
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.Read less <
English Keywords
Dielectrics
Polaron
Magnetism
BaTiO3
Iron
Single crystal
Origin
Hal imported