Control of the colossal magnetoresistance by strain effect in Nd$_{0.5}$Ca$_{0.5}$MnO$_{3}$ thin films

E. Rauwel-Buzin; W. Prellier; Ch. Simon; S. Mercone; B. Mercey; B. Raveau; J. Sebek; J. Hejtmanek

doi:10.1063/1.1390313

paper

Control of the colossal magnetoresistance by strain effect in Nd $_{0.5}$ Ca $_{0.5}$ MnO $_{3}$ thin films

arXiv:cond-mat/0106459 · doi:10.1063/1.1390313

Abstract

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 $ρ (H = 0 T) / ρ (H = 7 T)$ 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 $A ˚$ 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.

9 pages, 4 figures. To be published in Applied Physics Letters

Control of the colossal magnetoresistance by strain effect in Nd0.5​Ca0.5​MnO3​ thin films

Abstract

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Control of the colossal magnetoresistance by strain effect in Nd $_{0.5}$ Ca $_{0.5}$ MnO $_{3}$ thin films