Physics – Condensed Matter – Materials Science
Scientific paper
2005-09-28
J. Appl. Phys. 98 (2005) 093903
Physics
Condensed Matter
Materials Science
to be published in Journal of Applied Physics
Scientific paper
Thin films of Sm0.5Ca0.5MnO3 manganites with charge ordering (CO) properties and colossal magnetoresistance were synthesized by pulsed laser deposition technique on (100)-SrTiO3 and (100)-LaAlO3 substrates. We first compare the structural modifications as function of the substrate and film thickness. Secondly, measuring transport properties in magnetic fields up to 24T, we establish the temperature-field phase diagram describing the stability of the CO state and compare it to bulk material. We show that some structural modification induced by the substrate occurs and that the CO melting magnetic field is greatly reduced. Moreover, with the temperature decrease, no modification of the lattice parameters is observed. We then propose an explanation based on the quenching of the unit cell of the film that adopts the in-plane lattice parameters of the substrate and thus, prevents the complete growth of the CO state at low temperature.
Brion Sophie de
Chouteau G.
Mercey Bernard
Prellier Wilfrid
Rauwel E.
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