Abstract
We have investigated systematically the physical transport properties of layered 112-typecobaltite by means of electrical resistivity, magnetoresistance and thermopowermeasurements. In order to understand the complex transport mechanism ofLaBaCo2O5.5, the data have been analysed using different theoretical models. The compoundshows an electronic transition between two semiconducting states around 326 K,which coincides with the ferromagnetic transition. Interestingly, the system alsodepicts a significant magnetoresistance (MR) effect near the ferro/antiferromagneticphase boundary and the highest value of MR is close to 5% at 245 K under ± 7 T. The temperature dependence of thermopower,S(T), exhibits p-typeconductivity in the 60 K≤T≤320 K range and reaches a maximum value of around303 µV K−1 (at 120 K). In the low temperature antiferromagnetic region the unusualS(T) behaviour, generally observed for the cobaltite seriesLnBaCo2O5.5 (Ln = rare earth), is explained by the electron magnon scattering mechanism.
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