Berlin 2008 – wissenschaftliches Programm

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SYNF: Symposium Ferroic materials and novel functionalities

SYNF 1: Ferroic materials and novel functionalities I

SYNF 1.5: Vortrag

Dienstag, 26. Februar 2008, 11:30–11:45, A 151

Dynamic strain in metallic vs insulating manganite films — •Martina Cornelia Dekker, Steffen Oswald, Ludwig Schultz, and Kathrin Doerr — IFW Dresden, Germany

The use of a ferro- and piezoelectric substrate, PMN-PT (001) (PbMg_1/3Nb_2/3O₃)_0.72(PbTiO₃)_0.28, allows us to biaxially compress as grown epitaxial films by as much as 0.2% [1]. This reversible dynamic strain process gives a unique insight into the effect of strain on perovskite oxides, eliminating effects such as varying oxygen concentration, which may occur when several substrates with different lattice mismatch are used.

We have prepared PLCMO (Pr_1−xLa_x)_0.7Ca_0.3MnO₃ films on PMN-PT substrates for a range of x values. Around x=0.6, the system exhibits a transition from an insulating to a metallic ground state. We have recorded changes in magnetic moment and transition temperature upon varying x, and compared the effects of dynamic strain on transport behaviour in the metallic and insulating ground states.

[1] C. Thiele et al., Phys. Rev. B 75, 054408 (2007)