Local structure and magnetic properties of Mn substituted manganites studied by EXAFS and Dc magnetic measurements (Articolo in rivista)

Type
Label
  • Local structure and magnetic properties of Mn substituted manganites studied by EXAFS and Dc magnetic measurements (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.ssc.2005.07.012 (literal)
Alternative label
  • C. Castellano (a); F. Cordero (b); O. Palumbo (a,f); R. Cantelli (a); R. Cimberle (c); M. Tropeano (c); A. Martinelli (d); M. Ferretti (d,e) (2005)
    Local structure and magnetic properties of Mn substituted manganites studied by EXAFS and Dc magnetic measurements
    in Solid state communications (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • C. Castellano (a); F. Cordero (b); O. Palumbo (a,f); R. Cantelli (a); R. Cimberle (c); M. Tropeano (c); A. Martinelli (d); M. Ferretti (d,e) (literal)
Pagina inizio
  • 244 (literal)
Pagina fine
  • 249 (literal)
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  • http://www.sciencedirect.com/science/article/pii/S003810980500637X (literal)
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  • 136 (literal)
Rivista
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  • fasc. (4). Elsevier. (literal)
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  • 4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • a) Dipartimento di Fisica and INFM, Università di Roma ‘La Sapienza’, P.le A. Moro 2, I-00185 Roma, Italy b) CNR-ISC, Istituto dei Sistemi Complessi, Area della Ricerca di Roma ‘Tor Vergata’, Italy c) CNR-IMEM c/o Dipartimento di Fisica, Genova, Italy d) INFM-LAMIA, C.so Perrone 24, I-16152 Genova, Italy e) Dip. Chimica e Chimica Industriale, Genova, Italy f) Dipartimento di Fisica, CNR-INFM c/o Roma ‘La Sapienza’, P.le A Moro 2 I-00185 Roma, Italy (literal)
Titolo
  • Local structure and magnetic properties of Mn substituted manganites studied by EXAFS and Dc magnetic measurements (literal)
Abstract
  • We report extended X-ray absorption fine structure (EXAFS) measurements at the Mn K edge and magnetic measurements performed on (La1-xCax)(Mn1-yMy)O3 samples (M=Cr or Ni; x=0.37 and 0.75 and y=0.03 or 0.08). The Mn substitution produces important effects on both the sides of the LaMnO3–CaMnO3 phase diagram. For x<0.5 the ferromagnetic–metallic phase maintains its main character even after Mn substitution, but both the doping species (Ni or Cr) lower TC and broaden the magnetic transition, and the EXAFS study evidences two Mn–O distances, suggesting the presence of zones of distorted insulating phase. For x>0.5, after the doping with Cr, the charge ordered phase persists but on a shorter scale, whereas the Jahn–Teller distortion is weakened as indicated by EXAFS measurements, and the formation of ferromagnetic clusters is evidenced by magnetic measurements. EXAFS and magnetic measurements are in mutual agreement, thus confirming the correlation between the local disorder determined by charge localization and magnetic degrees of freedom. (literal)
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