Effect of Cr substitution on the crystal and magnetic structure of (Pr0.55Ca0.45)MnO3 (Articolo in rivista)

Type
Label
  • Effect of Cr substitution on the crystal and magnetic structure of (Pr0.55Ca0.45)MnO3 (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • A. Martinelli, M. Ferretti, C. Castellano, M.R. Cimberle, M. Tropeano and C. Mondelli (2006)
    Effect of Cr substitution on the crystal and magnetic structure of (Pr0.55Ca0.45)MnO3
    in Advances in science and technology (Online)
    (literal)
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  • A. Martinelli, M. Ferretti, C. Castellano, M.R. Cimberle, M. Tropeano and C. Mondelli (literal)
Pagina inizio
  • 93 (literal)
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  • 52 (literal)
Rivista
Note
  • Google Scholar (literal)
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  • 1INFM-LAMIA-CNR, C.so Perrone 24, 16152 Genova, Italy 2Dipartimento di Chimica e Chimica Industriale, Universit√† di Genova, Via Dodecaneso 31, 16146 Genova, Italy 3Dipartimento di Fisica, Universit√† di Roma \"La Sapienza,\" P. le A. Moro 2, 00185 Roma, Italy 4CNR-INFM and CRS Soft, Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Genoble Cedex 9, France 5CNR-IMEM sezione di Genova c/o Dipartimento di Fisica, Universit√† di Genova, Via Dodecaneso 33, 16146, Genova, Italy (literal)
Titolo
  • Effect of Cr substitution on the crystal and magnetic structure of (Pr0.55Ca0.45)MnO3 (literal)
Abstract
  • The crystal and magnetic structures of (Pr0.55Ca0.45)(Mn1-yCry)O3 (y = 0.00, 0.03, 0.06) have been investigated between 5 and 300 K by means of neutron powder diffraction followed by Rietveld refinement and dc magnetic measurements. An orthorhombic-to-monoclinic phase transition occurs on cooling in (Pr0.55Ca0.45)MnO3; at lower temperature charge ordering in the Mn sub-lattice, coupled with orbital ordering, induces an anti-ferromagnetic (AFM) spin ordering within the monoclinic phase. Cr substitution at the Mn site hinders the phase transition, although for the y = 0.03 sample small amounts of the monoclinic phase co-exist at low temperature with the main phase characterized by an orthorhombic structure. In addition Cr favours ferromagnetism (FM) participating to the double exchange mechanism. Cr substitution prevents charge ordering, favouring double exchange and hence FM spin ordering within the Mn sub-lattice. The Curie temperature of the Cr substituted samples is independent on the Cr content. (literal)
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