Physics – Condensed Matter – Materials Science
Scientific paper
2001-06-22
Appl. Phys. Lett. 79 (2001) 647
Physics
Condensed Matter
Materials Science
9 pages, 4 figures. To be published in Applied Physics Letters
Scientific paper
10.1063/1.1390313
Thin films of Nd$_{0.5}$Ca$_{0.5}$MnO$_{3}$ manganites with colossal magnetoresistance (CMR) properties have been synthesized by the Pulsed Laser Deposition technique on (100)-SrTiO$_{3}$. The lattice parameters of these manganites and correlatively their CMR properties can be controlled by the substrate temperature $T_{S}$. The maximum CMR effect at 75K, calculated as the ratio $\rho (H=0T)/\rho (H=7T)$ is 10$^4$ for a deposition temperature of $T_{S}=680$ degC. Structural studies show that the Nd$_{0.5}$Ca$_{0.5}$MnO$_{3}$ film is single phase, [010]-oriented and has a pseudocubic symmetry of the perovskite subcell with a=3.77$\AA$ at room temperature. We suggest that correlation between lattice parameters, CMR and substrate temperature $T_{S}$ result mainly from substrate-induced strains which can weaken the charge-ordered state at low temperature.
Hejtmanek Jiri
Mercey Bernard
Mercone Silvana
Prellier Wilfrid
Rauwel-Buzin E.
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