Substrate-induced strain effects on Pr_{0.6}Ca_{0.4}MnO_{3} films

Details Substrate-induced strain effects on Pr_{0.6}Ca_{0.4}MnO_{3} films Substrate-induced strain effects on Pr_{0.6}Ca_{0.4}MnO_{3} films

2003-03-12

arxiv.org/abs/cond-mat/0303228v1

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 7 figures

Scientific paper

10.1088/0953-8984/16/1/002

We report the characterization of the crystal structure, low-temperature charge and orbital ordering, transport, and magnetization of Pr_{0.6}Ca_{0.4}MnO_{3} films grown on LaAlO_{3}, NdGaO_{3}, and SrTiO_{3} substrates, which provide compressive (LaAlO_{3}) and tensile (NdGaO_{3} and SrTiO_{3}) strain. The films are observed to exhibit different crystallographic symmetries than the bulk material, and the low-temperature ordering is found to be more robust under compressive-- as opposed to tensile-- strain. In fact, bulk-like charge and orbital ordering is not observed in the film grown on NdGaO_{3}, which is the substrate that provides the least amount of nominal and measured, but tensile, strain. This result suggests the importance of the role played by the Mn--O--Mn bond angles in the formation of charge and orbital ordering at low temperatures. Finally, in the film grown on LaAlO_{3}, a connection between the lattice distortion associated with orbital ordering and the onset of antiferromagnetism is reported.

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