Investigation on transport properties of strained La0.85Ba0.15MnO3 thin films using hall measurement

La1 xBaxMnO3 thin films (0.05 x 0.2) with a tensile strain from substrate exhibit unusual film thickness dependence on the Curie temperature TC. The TC was found to increase up to room temperature with decreasing film thickness. In this study, the origin of the TC enhancement is examined by performing Hall measurements. The carrier densities of various thick films were found to be almost constant value ( 6 1020 cm 3) at 10 K, whereas Hall mobility drastically increased, from 5 cm2/V s for 729-nm thick film to 50 cm2/V s for 24-nm thick film. These results indicate that the TC enhancement is induced by increase of carrier transfer due to lattice deformation of Mn–O–Mn networks