Epitaxial La0.7Ca0.3MnO3 (LCMO) thin films have been deposited by high pressure DC sputtering technique on SrTiO3 substrates. As-grown films exhibit metal - insulator transition temperature (T-MI) with values ranging from 131 to 220 K. The maximum value of the magnetoresistance is of about - 77% in a magnetic field of 0.5 T for T-MI = 131 K. The same films, annealed in a pure oxygen atmosphere, exhibit transitions to a metallic state at temperatures ranging from 210 to 284 K. Transmission electron microscopy analyses show a coherent growth between film and substrate.
Effect of oxygen post-annealing on the magnetoresistance of highly epitaxial La0.7Ca0.3MnO3 thin films / A., DE SANTIS; Barucca, Gianni; F., Bobba; Caciuffo, ROBERTO GIOVANNI MARIA; K., Fröhlich; M., Pripko; A. M., Cucolo. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - 272:(2004), pp. 1501-1502. [10.1016/j.jmmm.2003.12.288]
Effect of oxygen post-annealing on the magnetoresistance of highly epitaxial La0.7Ca0.3MnO3 thin films.
BARUCCA, Gianni;CACIUFFO, ROBERTO GIOVANNI MARIA;
2004-01-01
Abstract
Epitaxial La0.7Ca0.3MnO3 (LCMO) thin films have been deposited by high pressure DC sputtering technique on SrTiO3 substrates. As-grown films exhibit metal - insulator transition temperature (T-MI) with values ranging from 131 to 220 K. The maximum value of the magnetoresistance is of about - 77% in a magnetic field of 0.5 T for T-MI = 131 K. The same films, annealed in a pure oxygen atmosphere, exhibit transitions to a metallic state at temperatures ranging from 210 to 284 K. Transmission electron microscopy analyses show a coherent growth between film and substrate.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
