Magnetic and electrical properties ofLBaMn2O6−γ(L=Pr,Nd, Sm, Eu, Gd, Tb) manganites
作者： S. V. Trukhanov , I. O. Troyanchuk , M. Hervieu , H. Szymczak , K. Bärner
DOI: 10.1103/PHYSREVB.66.184424
关键词:
摘要: Influence of cation order-disorder phenomena on the crystal structure, magnetic, and electrical transport properties new CMR perovskites for LBaMn 2 O 6 - γ (L=Pr, Nd, Sm, Eu, Gd, Tb) series has been investigated. For each rare-earth ion three compounds have synthesized by topotactic reduction-oxidation method. Structural investigations shown oxygen-stoichiometry compound obtained in air to be cubic with disordered L 3 + Ba cations whereas oxygen-deficient 5 is tetragonal ordered alternate stacking rare earth barium containing layers along c. This structure similar YBaCuFeO related one. Another form reoxidation also retains ordering cations. It notable that reoxidized EuBaMn an orthorhombic unit cell. observed this type leads considerable increase transition temperature paramagnetic state. example, magnetic spin glass shows freezing moments T f 40 K while inhomogeneous ferromagnet Curie point C 260 K. Electrical resistivity behavior correlates magnetization. Below Pr, Sm based undergo a metallic state demonstrate peak magnetoresistance. supposed remarkable changing consequence L/Ba can explained base Goodenough-Kanamori rules 180° indirect superexchange interactions taking into account size effect A sublattice perovskite.
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