caa a22 4500 388022175 CHVBK 20180307124927.0 cr unu---uuuuu 161130e199808 xx s 000 0 eng 10.1557/JMR.1998.0302 doi S0884291400045386 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0302 Transmission electron microscopy and x-ray structural investigation of La0.7Ca0.3MnO3 thin films [Elektronische Daten] The structural changes and magnetoresistance (MR) properties of as-grown and post-annealed La0.7Ca0.3MnO3 films were investigated by transmission electron microscopy (TEM) and x-ray diffraction (XRD). The data for the films were compared to that for bulk La0.7Ca0.3MnO3 post-annealed under the same conditions. The main structure of the as-grown films was face-centered pseudo-cubic with a doubled perovskite unit cell, of size ∼2ap × ∼2ap × 2ap, where ap is the single perovskite parameter. The phase showed a cube-on-cube epitaxy with the underlying LaAlO3 substrate. Upon annealing to a saturation point, a minor primitive pseudo-tetragonal structure evolved, of cell parameters . A total of four possible orientations of the two structures was observed by TEM, comprised of one orientation of the ∼ 2ap × ∼ 2ap × ∼ 2ap cell, i.e., the cube-on-cube epitaxy, giving rise to (00l) peaks in x-ray, and three orientations of the cell, giving rise to a single (00l)/(hk0) peak in x-ray. The bulk La0.7Ca0.3MnO3 sample also contains the × structure. The difference between the bulk and the film and the effects of annealing on films can be ascribed to the influence of strain between the film and substate, induced by lattice mismatch. Copyright © Materials Research Society 1998 Li Y. H. Department of Materials, Imperial College, Prince Consort Road, London, SW7 2BP, United Kingdom Thomas K. A. Department of Materials, Imperial College, Prince Consort Road, London, SW7 2BP, United Kingdom de Silva P. S. I. P. N. Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BZ, United Kingdom Cohen L. F. Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BZ, United Kingdom Goyal A. Department of Materials Science, University of Cambridge, Cambridge CB2 3QZ, United Kingdom Rajeswari M. Department of Physics and Electrical Engineering, University of Maryland, College Park, Maryland Mathur N. D. Department of Materials Science, University of Cambridge, Cambridge, CB2 3QZ, United Kingdom Blamire M. G. Department of Materials Science, University of Cambridge, Cambridge, CB2 3QZ, United Kingdom Evetts J. E. Department of Materials Science, University of Cambridge, Cambridge, CB2 3QZ, United Kingdom Venkatesan T. Department of Physics and Electrical Engineering, University of Maryland, College Park, Maryland MacManus-Driscoll J. L. Department of Materials, Imperial College, Prince Consort Road, London SW7 2BP, United Kingdom Journal of Materials Research Cambridge University Press 13/8(1998-08), 2161-2169 0884-2914 13:8<2161 1998 13 JMR https://doi.org/10.1557/JMR.1998.0302 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0302 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Y. H. Department of Materials, Imperial College, Prince Consort Road, London, SW7 2BP, United Kingdom NATIONALLICENCE 700 1- Thomas K. A. Department of Materials, Imperial College, Prince Consort Road, London, SW7 2BP, United Kingdom NATIONALLICENCE 700 1- de Silva P. S. I. P. N. Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BZ, United Kingdom NATIONALLICENCE 700 1- Cohen L. F. Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BZ, United Kingdom NATIONALLICENCE 700 1- Goyal A. Department of Materials Science, University of Cambridge, Cambridge CB2 3QZ, United Kingdom NATIONALLICENCE 700 1- Rajeswari M. Department of Physics and Electrical Engineering, University of Maryland, College Park, Maryland NATIONALLICENCE 700 1- Mathur N. D. Department of Materials Science, University of Cambridge, Cambridge, CB2 3QZ, United Kingdom NATIONALLICENCE 700 1- Blamire M. G. Department of Materials Science, University of Cambridge, Cambridge, CB2 3QZ, United Kingdom NATIONALLICENCE 700 1- Evetts J. E. Department of Materials Science, University of Cambridge, Cambridge, CB2 3QZ, United Kingdom NATIONALLICENCE 700 1- Venkatesan T. Department of Physics and Electrical Engineering, University of Maryland, College Park, Maryland NATIONALLICENCE 700 1- MacManus-Driscoll J. L. Department of Materials, Imperial College, Prince Consort Road, London SW7 2BP, United Kingdom NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/8(1998-08), 2161-2169 0884-2914 13:8<2161 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge