Cooperative enhancement of in-plane orbital ordering by oxygen deficiency and in-plane tensile strain in La0.7Sr0.3MnO3-delta thin films (Articolo in rivista)

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Label
  • Cooperative enhancement of in-plane orbital ordering by oxygen deficiency and in-plane tensile strain in La0.7Sr0.3MnO3-delta thin films (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Aruta, C; Balestrino, G; Tebano, A; Ghiringhelli, G; Brookes, NB (2007)
    Cooperative enhancement of in-plane orbital ordering by oxygen deficiency and in-plane tensile strain in La0.7Sr0.3MnO3-delta thin films
    in Europhysics letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Aruta, C; Balestrino, G; Tebano, A; Ghiringhelli, G; Brookes, NB (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 80 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Naples Federico 2, CNR INFM Cohenrentia, I-80125 Naples, Italy; Univ Naples Federico 2, Dipartimento Sci Fisiche, I-80125 Naples, Italy; Univ Roma Tor Vergata, CNR INFM Coherentia, I-00133 Rome, Italy; Univ Roma Tor Vergata, Dipartimento Ingn Meccan, I-00133 Rome, Italy; Politecn Milan, CNR INFM Coherentia, I-20133 Milan, Italy; Politecn Milan, Dipartmento Fis, I-20133 Milan, Italy; European Synchrotron Radiat Facil, F-38043 Grenoble, France (literal)
Titolo
  • Cooperative enhancement of in-plane orbital ordering by oxygen deficiency and in-plane tensile strain in La0.7Sr0.3MnO3-delta thin films (literal)
Abstract
  • The development of in-plane orbital ordering with oxygen deficiency is investigated in epitaxially strained thin films of La0.7Sr0.3MnO3-delta grown under in-plane tensile strain on SrTiO3 substrates. The orbital character of 3d states is directly probed by linear dichroism in X-ray absorption spectroscopy at the Mn L-2,L-3 and O K edges. The electrical transport measurements show a rapid decrease of the metal-insulator transition temperature and an increase of the polaronic activation energy when reducing the oxygen content. The diffraction measurements show a contraction of the average out-of-plane lattice parameter due to an enhancement of the regular distribution of the Mn3+ distorted octahedra in oxygen-deficient films. We show that the oxygen deficiency and the in-plane tensile strain cooperate to stabilize the in-plane orbital occupation: the oxygen deficiency is responsible for the increased number of Jahn-Teller distorted octahedra and the in-plane tensile strain drives the arrangement of such octahedra, favoring the in-plane confinement of the e(g) orbitals. Linear dichroism in X-ray absorption also demonstrates that the Mn 3d/O 2p hybridization changes little with the oxygen content, thus confirming that the in-plane orbital ordering is the main factor influencing the transport properties. Copyright (C) EPLA, 2007 (literal)
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