YBaMn2O5:: Crystal and magnetic structure reinvestigation

被引:62
作者
Millange, F
Suard, E
Caignaert, V
Raveau, B
机构
[1] Univ Caen, ISMRA, Lab CRISMAT, F-14050 Caen, France
[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
关键词
oxides; chemical synthesis; neutron scattering; crystal structure; magnetic structure;
D O I
10.1016/S0025-5408(98)00214-1
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The ordered oxygen-deficient perovskite YBaMn2O5 has been synthesized as a monophasic sample. A variable temperature neutron diffraction study of this phase has been carried out. The crystal structure of this manganite was solved in the space group P4/nmm (a = 5.547 Angstrom and c = 7.649 Angstrom). This oxide, which is closely related to the YBaCuFeO5 structure, forms an alternate stacking of yttrium and barium layers along the c axis. It differs from the latter, however, by the existence of two distinct sites for manganese, corresponding to an ordering of the Mn3+ and Mn2+ cations, respectively. Elucidation of the magnetic structure of YBaMn2O5, from low temperature PND (powder neutron diffraction) data, leads to a G-type antiferromagnetic model; the superimposed Mn2+/Mn3+ charge order results in ferrimagnetic behavior for this phase and explains its magnetic properties, as obtained from susceptibility measurements, (C) 1999 Elsevier Science Ltd.
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页码:1 / 9
页数:9
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