Strain-induced phase separation in La0.7Sr0.3MnO3 thin films (Articolo in rivista)

Type
Label
  • Strain-induced phase separation in La0.7Sr0.3MnO3 thin films (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.74.245116 (literal)
Alternative label
  • Tebano, A; Aruta, C; Medaglia, PG; Tozzi, F; Balestrino, G; Sidorenko, AA; Allodi, G; De Renzi, R; Ghiringhelli, G; Dallera, C; Braicovich, L; Brookes, NB (2006)
    Strain-induced phase separation in La0.7Sr0.3MnO3 thin films
    in Physical review. B, Condensed matter and materials physics (Online); American Physical Society (APS), College Pk (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Tebano, A; Aruta, C; Medaglia, PG; Tozzi, F; Balestrino, G; Sidorenko, AA; Allodi, G; De Renzi, R; Ghiringhelli, G; Dallera, C; Braicovich, L; Brookes, NB (literal)
Pagina inizio
  • 2451161 (literal)
Pagina fine
  • 2451167 (literal)
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  • 74 (literal)
Rivista
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  • 7 (literal)
Note
  • Scopus (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Roma Tor Vergata, CNR IN Coherentia, I-00133 Rome, Italy; Univ Roma Tor Vergata, Dipartimento Ingn Meccan, I-00133 Rome, Italy; CNISM Parma, Dipartimento Fis, I-43100 Parma, Italy; Politecn Milan, Dipartimento Fis, CNR INFM Coherentia & Soft, I-20133 Milan, Italy; European Synchrotron Radiat Facil, F-38043 Grenoble, France (literal)
Titolo
  • Strain-induced phase separation in La0.7Sr0.3MnO3 thin films (literal)
Abstract
  • La0.7Sr0.3MnO3 thin films having different thicknesses were grown by pulsed laser deposition with in situ reflection high energy electron diffraction diagnostics on LaAlO3 substrates. The mismatch between film and substrate gives rise to an in-plane compressive biaxial strain, which partially relaxes in films thicker than 30 unit cells. Accordingly, the ratio between the out-of-plane and the in-plane lattice parameter (c/a) varies between 1.06 (fully strained) and 1.03 (partially relaxed). In-plane compressive strain favors the stabilization of the 3z(2)-r(2) orbitals (chain-type antiferromagnetic phase), thus giving rise to a sizeable x-ray absorption linear dichroism signal. The shape of the linear dichroism depends weakly on the c/a ratio, while its intensity strongly increases with c/a. At the same time, the metal-insulator transition temperature shifts from about 360 K towards lower temperatures with decreasing thickness, eventually reaching an insulating state for the 30 unit cells film. Low-temperature nuclear magnetic resonance spectra show a decrease of the Mn-DE double-exchange metallic contribution with decreasing the thickness, which becomes negligible in the 30 unit cells thick film. The experimental results demonstrate a strain driven competition between two stable phases: the orbital ordered chain-type insulating antiferromagnetic and the orbital disordered metallic ferromagnetic. For intermediate values of the epitaxial strain the local minimum state of the system lies in a gap region between the two stable phases. Such a region has glassy characteristics with coexisting clusters of the two phases. The strain is used as a driving force to span the glassy region. (literal)
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