Neutron diffraction evidence for double exchange coupling in Ru-substituted La0.6Pb0.4Mn1-xRuxO3, 0 <= x <= 0.5 (Articolo in rivista)

Type
Label
  • Neutron diffraction evidence for double exchange coupling in Ru-substituted La0.6Pb0.4Mn1-xRuxO3, 0 <= x <= 0.5 (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Siruguri, V; Gutierrez, J; Barandiaran, JM; Lazpita, P; Singh, B; Sahu, RK; Manoharan, SS; Henry, P; Mondelli, C (2006)
    Neutron diffraction evidence for double exchange coupling in Ru-substituted La0.6Pb0.4Mn1-xRuxO3, 0 <= x <= 0.5
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Siruguri, V; Gutierrez, J; Barandiaran, JM; Lazpita, P; Singh, B; Sahu, RK; Manoharan, SS; Henry, P; Mondelli, C (literal)
Pagina inizio
  • 408 (literal)
Pagina fine
  • 410 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 385 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Pais Vasco, Dept Elect & Elect, E-48080 Bilbao, Spain; Indian Inst Technol, Dept Chem, Kanpur 208016, Uttar Pradesh, India; Natl Metallurgical Lab, Jamshedpur 831007, Bihar, India; Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France; INFM OGG & CRS SOFT, F-38042 Grenoble, France (literal)
Titolo
  • Neutron diffraction evidence for double exchange coupling in Ru-substituted La0.6Pb0.4Mn1-xRuxO3, 0 <= x <= 0.5 (literal)
Abstract
  • Double exchange (DE)-mediated ferromagnetism in manganites, in which the Zener pair (Mn3+/Mn4+) is a key factor, is marked by the coexistence of the magnetic transition and the metal-insulator transition, thus distinguishing itself from superexchange (SE)-mediated ferromagnetism. Through detailed magnetization, transport and XAS studies, it was proposed by some of us that a unique magnetic pair-making effect occurs in Ru-substituted La0.6Pb0.4Mn1-xRUxO3 by virtue of variable valency of Ru and Mn. Ru ion, exhibiting a variable valency of Ru4+ and Ru5+, governs the DE-mediated coupling by initiating a magnetic pair-making effect with Mn3+ and Mn4+ states. Neutron diffraction measurements carried out on these compounds in the temperature range 4.2-500 K reveal the microscopic nature of magnetic ordering. Data obtained, in conjunction with data from other experimental techniques above, show that (i) Ru participates in the DE interaction with Mn for x <= 0.4, (ii) there is a weakening of DE due to depletion of Ru5+ for x > 0.4, and (iii) SE ferromagnetic interactions are favored for x > 0.4. (c) 2006 Elsevier B.V. All rights reserved. (literal)
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