skip to main content

SciTech ConnectSciTech Connect

Title: Correlation between the electronic and atomic structure, transport properties, and oxygen vacancies on La{sub 0.7}Ca{sub 0.3}MnO{sub 3} thin films

We present a study of the role of oxygen vacancies on the atomic and electronic structure and transport properties on a 20 nm thick La{sub 0.7}Ca{sub 0.3}MnO{sub 3} film grown by the pulsed laser deposition method on a SrTiO{sub 3} (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 MnO{sub 6} 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.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Spanish CRG BM25-SpLine beamline at the ESRF, 6 Rue Jules Horowitz, BP 220, F-38043 Grenoble Cedex 09 (France)
  2. (Spain)
  3. Diamond Light Source, Harwell Science and Innovation Campus, Chilton, Didcot OX11 0DE (United Kingdom)
Publication Date:
OSTI Identifier:
22275718
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ENERGY BEAM DEPOSITION; LASER RADIATION; LATTICE PARAMETERS; MANGANESE; MANGANESE OXIDES; OXYGEN; PEROVSKITE; PULSED IRRADIATION; STRONTIUM TITANATES; THIN FILMS; VACANCIES