Revealing polarons with high pressure on low electron-doped manganites

Pressure sensitivity (up to 1 GPa) of the electrical resistivity and of the ac susceptibility was measured for low electron-doping levels of Ca 1-xYxMnO3 (CYMO) and of Ca1-xSm xMnO3 (CSMO) ceramic samples (0.05≤x≤0.15). A very weak pressure dependence of the Curie temperature (Tc) was observed for b...

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Detalles Bibliográficos
Autores principales: Garbarino, G., Acha, C., Vega, D., Leyva, G., Polla, G., Martin, C., Maignan, A., Raveau, B.
Formato: JOUR
Materias:
calcium ion
manganese derivative
manganite
oxide
samarium
unclassified drug
yttrium
article
atomic particle
ceramics
chemical modification
electric resistance
electron doping
electron transport
hyperbarism
intermethod comparison
metal binding
molecular interaction
phonon
polaron
pressure measurement
sampling
sensitivity analysis
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01631829_v70_n1_p014414_Garbarino
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Pressure sensitivity (up to 1 GPa) of the electrical resistivity and of the ac susceptibility was measured for low electron-doping levels of Ca 1-xYxMnO3 (CYMO) and of Ca1-xSm xMnO3 (CSMO) ceramic samples (0.05≤x≤0.15). A very weak pressure dependence of the Curie temperature (Tc) was observed for both systems (∼6 K GPa-1), when compared to the hole-doped manganites of the same Tc (∼20 K GPa-1). Our results can be interpreted within a modified double exchange scenario, where pressure alters the reduction of the bandwidth produced by the electron-phonon interaction associated with small Fröhlich polarons in the weak to intermediate coupling regime.

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