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Structural, Magnetic and Magnetotransport Properties of La 0.7 Pb 0.3 (Mn 1– x Ni x )O 3 (0.1 ≤ x ≤ 0.3) CMR Manganites
Author(s) -
Peña Alazne,
Gutiérrez Jon,
Campo Javier,
Barandiarán Jose Manuel,
Lezama Luis,
Gil de Muro Izaskun,
Rojo Teófilo
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200701173
Subject(s) - curie temperature , chemistry , magnetoresistance , ferromagnetism , electrical resistivity and conductivity , magnetic moment , analytical chemistry (journal) , ion , doping , crystallography , condensed matter physics , magnetic field , physics , organic chemistry , quantum mechanics , engineering , chromatography , electrical engineering
Structural and magnetic properties of La 0.7 Pb 0.3 (Mn 1– x Ni x )O 3 (0.1 ≤ x ≤ 0.3) manganites are reported. Samples were fabricated by the sol–gel low‐temperature method. At room temperature, the first structural characterization of all phases indicated the rhombohedral space group ( R $\bar {3}$ c ). All compositions show ferromagnetic behaviour and magnetoresistance. The measured low‐temperature magnetic moment and the Curie temperature continuously decrease, with respect to the undoped composition, as Mn ions are substituted progressively by Ni. This is interpreted in terms of direct substitution of Mn 3+ by low‐spin (LS) Ni 3+ ions. The measured magnetoresistance reaches 46 % for the 10 % Ni‐doped composition and 28 % for the 30 % Ni‐doped one at the corresponding Curie temperature. The resistivity behaviour of all the studied compounds is fully determined by the intergrainconduction mechanism, with grain sizes in the range20–45 nm.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)