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Revealing polarons with high pressure on low electron-doped manganites | | G. Garbarino
; C. Acha
; D. Vega
; G. Leyva
; G. Polla
; C. Martin
; A. Maignan
; B. Raveau
; | | Date: |
2 Oct 2003 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | Pressure sensitivity (up to 1 GPa) of the electrical resistivity and of the ac susceptibility was measured for low electron doping levels of Ca$_{1-x}$Y$_x$MnO$_3$ (CYMO) and of Ca$_{1-x}$Sm$_x$MnO$_3$ (CSMO) ceramic samples (0.05 $leq$ x $leq$ 0.15). A very weak pressure dependence of the Curie temperature (T$_c$) was observed for both systems ($sim$ 6 K GPa$^{-1}$), when compared to the hole-doped manganites of the same T$_c$ ($sim$ 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. | | Source: | arXiv, cond-mat/0310044 | | Services: | Forum | Review | PDF | Favorites | |
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