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artículo con referato
"Revealing Polarons with High Pressure on Low Electron-Doped Manganites"
G. Garbarino, C. Acha, D.R. Vega, A.G. Leyva, G.I. Polla, C. Martin, A. Maignan and B. Raveau
Phys. Rev. B 70(1) (2004) 014414/1-5
Pressure sensitivity (up to 1 Gpa) of the electrical resistivity and of the ac susceptibility was measured for low electron doping levels of Ca1-xYxMnO3 (CYMO) and of Ca1-xYxMnO3 (CSMO) ceramic samples (0.05 < x < 0.15). A very low pressure dependence of the Curie temperature (Tc) was observed for both systems (~ 6 K Gpa-1), when compared with 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 Fröhlich polarons in the weak-coupling regime.
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