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"High-pressure effects on the resistivity and ferromagnetic transition of ceramic manganite Ca1-xYxMnO3"
G. Garbarino, S. Parón, M. Monteverde, C. Acha, G. Leyva, D. Vega, G. Polla, J. Briático and B. Alascio
Proc. of the "International Conference on Magnetism" (ICM 2000), Recife, Brazil, August 6-11, 2000. Ed. Dr. S.M. Rezende
J. Magn. Magn. Mater. 226-230, Part 1 (2001) 843-844
The effect of hydrostatic pressure up to 1 GPa on the electrical resistivity and on the ferromagnetic transition temperature Tc is systematically investigated for the electron doped manganite Ca1-xYxMnO3 for low electron density (x=0.2). We find that Tc is nearly constant for pressures roughly below 0.5 GPa and shows a linear increase for higher pressures, with a slope varying with the x content. Our results are discussed considering the enhancement of the electronic bandwidth with pressure related to double exchange and polaronic contributions. The unusual pressure dependence of Tc obtained can also be related to a competition scenario between double exchange mechanism and antiferromagnetic superexchange interactions proposed for electron doped manganites.
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