Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-03-28
Physics
Condensed Matter
Strongly Correlated Electrons
Physical Review B, to be published
Scientific paper
10.1103/PhysRevB.77.205101
In this work the charge transport properties of charge ordered (CO) La1-xCaxMnO3 (LCMO) (x= 0.55, 0.67) epitaxial thin films and polycrystals are discussed following the recent controversy of localised electron states vs. weakly or de- localised charge density wave (CDW) states in CO manganites. The transport properties were investigated by current vs. voltage, direct current resistivity vs. temperature, local activation energy vs. temperature, magnetoresistance and admittance spectroscopy measurements, which all indicated a localised electronic structure in the single CO phase. Delocalised charge anomalies observed previously may be restricted to phase separated materials.
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