Control of the colossal magnetoresistance by strain effect in Nd[sub 0.5]Ca[sub 0.5]MnO[sub 3] thin films

Rauwel Buzin, E.; Prellier, W.; Simon, Ch.; Mercone, S.; Mercey, B.; Raveau, B.; Sebek, J.; Hejtmanek, J.
July 2001
Applied Physics Letters;7/30/2001, Vol. 79 Issue 5
Academic Journal
Thin films of Nd[sub 0.5]Ca[sub 0.5]MnO[sub 3] manganites with colossal magnetoresistance (CMR) properties have been synthesized by the pulsed-laser deposition technique on (100)-(SrTiO[sub 3]). The lattice parameters of these manganites and correlatively their CMR properties can be controlled by the substrate temperature T[sub S]. The maximum CMR effect at 50 K, calculated as the ratio ρ(H=0T)/ρ(H=7T) is 10[sup 11] for a deposition temperature of T[sub S]=680 °C. Structural studies show that the Nd[sub 0.5]Ca[sub 0.5]MnO[sub 3] film is single phase, [010]-oriented and has a pseudocubic symmetry of the perovskite subcell with a=3.77 Å at room temperature. We suggest that correlation between lattice parameters, CMR, and substrate temperature T[sub S] result mainly from substrate-induced strains which can weaken the charge-ordered state at low temperature. © 2001 American Institute of Physics.


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