A network structure of a ferromagnetic metallic (FMM)∕charge-ordered insulator (COI) mixed phase manganite has been obtained by annealing a 150Å Pr0.65(Ca0.75Sr0.25)0.35MnO3 film under tensile strain on a SrTiO3 substrate. Under the same deposition and annealing conditions, a film deposited on a LaAlO3 substrate, which provides compressive strain, remains continuous. The network structure also manifests a larger magnetoresistance than the continuous film. It is suggested that the lateral confinement in this filamentary structure may affect the percolative transport in this mixed FMM∕COI system.
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Wu et al. (2005) studied this question.