Unconventional Hall effect in oriented CaCoO thin films
arXiv:cond-mat/0511374 · doi:10.1103/PhysRevB.73.033403
Abstract
Transport properties of the good thermoelectric misfit oxide CaCoO 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 ( 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.
arXiv commentSubmitted to Physical Review B (2005)
References in corpus (6)
- Strongly correlated properties of the thermoelectric cobalt oxide Ca3Co4O9
- Spectacular decrease of the melting magnetic field in the charge-ordered state of tensile Pr0.5Ca0.5MnO3 films
- Possible effects of charge frustration in NaCoO: bandwidth suppression, charge orders and resurrected RVB superconductivity
- Thermal conductivity of the thermoelectric layered cobalt oxides measured by the Harman method
- Perturbation theories for the S=1/2 spin ladder with four-spin ring exchange
- Influence of pulsed laser deposition growth conditions on the thermoelectric properties of Ca3Co4O9 thin films