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
  • V. Siruguri, J. Gutierrez, J.M. Barandiaran, P. Lazpita, Brajendra Singh, Ranjan K. Sahu, S. Sundar Manoharan, P. Henry, C. Mondelli (2006)
    Neutron diffraction evidence for double exchange coupling in Ru-substituted La0.6Pb0.4Mn1_xRuxO3, 0<=x<=0.5
    in Physica. B, Condensed matter (Print)
    (literal)
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  • V. Siruguri, J. Gutierrez, J.M. Barandiaran, P. Lazpita, Brajendra Singh, Ranjan K. Sahu, S. Sundar Manoharan, P. Henry, C. Mondelli (literal)
Pagina inizio
  • 408 (literal)
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  • 385-386 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
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  • Departamento de Electricidad y Electrónica, Universidad del País Vasco, P.O. Box 644, E-48080 Bilbao, Spain Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, India National Metallurgical Laboratory, Jamshedpur 831007, India Institut Laue-Langevin 6 rue Jules Horowitz, BP 156-38042 Grenoble, France INFM OGG & CRS-SOFT, 6 rue Jules Horowitz, BP 156-38042 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. (literal)
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