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Correlation between the electronic and atomic structure, transport properties, and oxygen vacancies on La0.7Ca0.3MnO3 thin films

DOI: 10.1063/1.4861385 DOI Help

Authors: J. Rubio-zuazo (ESRF; Instituto de Ciencia de Materiales de Madrid—ICMM/CSIC) , L. Onandia (ESRF; Instituto de Ciencia de Materiales de Madrid—ICMM/CSIC) , Pilar Ferrer Escorihuela (Diamond Light Source) , G. R. Castro (ESRF; Instituto de Ciencia de Materiales de Madrid—ICMM/CSIC)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Applied Physics Letters , VOL 104 (2)

State: Published (Approved)
Published: January 2014

Abstract: We present a study of the role of oxygen vacancies on the atomic and electronic structure and transport properties on a 20 nm thick La0.7Ca0.3MnO3 film grown by the pulsed laser deposition method on a SrTiO3 (001) substrate. The results show that oxygen vacancies induce an atomic structure modification characterized by the movement of the La/Ca cations to the perovskite regular position, by the reduction of the MnO6 basal plane rotation, and by a cooperative tilting of the octahedra along the out-of-plane direction. The out-of-plane lattice parameter increases due to the reduction of the Mn valence upon oxygen vacancies creation. As a consequence, a shift of the Metal-to-Insulator transition to lower temperatures is found to occur. We discuss the influence of the competitive phenomena of manganese valence and Mn-O-Mn bond distortion on the transport properties of manganite thin films.

Journal Keywords: Energy Beam Deposition; Laser Radiation; Lattice Parameters; Manganese; Manganese Oxides; Oxygen; Perovskite; Pulsed Irradiation; Strontium Titanates; Thin Films; Vacancies

Subject Areas: Materials, Physics

Facility: ESRF