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artículo con referato
"High resolution determination of ferromagnetic metallic limit in epitaxial La1-xCaxMnO3 films on NdGaO3"
D. Sánchez, L.E. Hueso, L. Granja, P. Levy and N.D. Mathur
Appl. Phys. Lett. 89(14) (2006) 142509/1-3
The physical properties of manganites depend strongly on sample morphology, probably due to strain. The authors investigate the influence of NdGaO3 substrates on the limit of the ferromagnetic-metallic phase field in La1-xCaxMnO3, doping with x = 1% resolution. Films with x = 0.40 show a metal-insulator transition, but the ferromagnetic volume fraction is half the spin aligned value. Films with x = 0.41 are similar but the metal-insulator transition is not always seen. Films with 0.42 ≤ x ≤ 0.45 are insulating, and the magnetization is dramatically reduced. The observed phase boundary indicates where to search for enhanced phase separation effects that may be exploited in thin films and devices.
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