Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-11-15
Phys. Rev. B 73 (2006) 033403
Physics
Condensed Matter
Strongly Correlated Electrons
Submitted to Physical Review B (2005)
Scientific paper
10.1103/PhysRevB.73.033403
Transport properties of the good thermoelectric misfit oxide Ca$_3$Co$_4$O$_9$ are examined. In-plane resistivity and Hall resistance measurements were made on epitaxial thin films which were grown on {\it c}-cut sapphire substrates using the pulsed laser deposition technique. Interpretation of the in-plane transport experiments relates the substrate-induced strain in the resulting film to single crystals under very high pressure ($\sim$ 5.5 GPa) consistent with a key role of strong electronic correlation. They are confirmed by the measured high temperature maxima in both resistivity and Hall resistance. While hole-like charge carriers are inferred from the Hall effect measurements over the whole investigated temperature range, the Hall resistance reveals a non monotonic behavior at low temperatures that could be interpreted with an anomalous contribution. The resulting unconventional temperature dependence of the Hall resistance seems thus to combine high temperature strongly correlated features above 340 K and anomalous Hall effect at low temperature, below 100 K.
Eng H. W.
Fresard Raymond
Limelette Patrice
Prellier Wilfrid
Simon Ch.
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