Pr0.7Ca0.15Ba0.15MnO3 manganite: Electron paramagnetic resonance, conductivity and susceptibility
作者： A. N. Ulyanov , H. D. Quang , N. E. Pismenova , S. C. Yu , G. G. Levchenko
DOI: 10.1016/J.SSC.2012.05.024
关键词: Manganite 、 Curie temperature 、 Ferromagnetism 、 Polaron 、 Materials science 、 Electrical resistivity and conductivity 、 Atmospheric temperature range 、 Condensed matter physics 、 Electron paramagnetic resonance 、 Magnetic susceptibility
摘要: Abstract We present a systematic experimental study of single phase Pr 0.7 Ca 0.15 Ba MnO 3 manganites. Ferromagnetic insulating state is observed in wide temperature range between the Curie point and peak resistivity temperature. Two approaches for analysis electron paramagnetic resonance (EPR) line-width (Δ H ) were considered details. The first approach based on proportionality dependencies inverse Δ . second model where ∝1/ Tχ dc ( χ static magnetic susceptibility). For studied manganites resistivity, associated with grain boundary scattering, follows Mott law; EPR line-width, suggested to be an intrinsic property, well described polaron hopping model.
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