Pseudomorphic strain effect on the charge-orbital ordering pattern in Pr0.5Sr0.5MnO3 epitaxial thin films -: art. no. 112513

We accomplished coherent epitaxial growth of a Pr0.5Sr0.5MnO3 thin film on (LaAlO3)(0.3)-(SrAl0.5Ta0.5O3)(0.7) (110) substrate, which demonstrates a robust charge-orbital ordering (COO) phase transition. In addition to the isotropic transport properties, a drastic recovery of high-resistivity state (>20 Omega cm) from a field-cooled metallic state (similar to 0.5 m Omega cm) was observed at 5 K with a release of a magnetic field. These results indicate a possible modification of COO pattern into CE-type COO state [d(3x(2)-r(2)/3y(2)-r(2))] in the film from A-type stripe COO state [d(x(2)-y(2))] observed in bulk samples by a substrate-induced strain. (C) 2005 American Institute of Physics.