Structural and magnetic study of PrBaCo2O5+δ (δ≃0.75) cobaltite -: art. no. 184428

被引：42
作者：
Frontera, C
García-Muñoz, JL
Carrillo, AE
Ritter, C
Marero, DMY
Caneiro, A
机构：
[1] CSIC, Inst Ciencia Mat Barcelona, E-08193 Barcelona, Spain
[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
[3] CSIC, Inst Ciencia Mat Aragon, Zaragoza, Spain
[4] Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
来源：
PHYSICAL REVIEW B | 2004年 / 70卷 / 18期
关键词：
D O I：
10.1103/PhysRevB.70.184428
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have investigated the structural and magnetic properties of PrBaCo2O5+delta (deltasimilar or equal to0.75) layered cobaltite. By means of neutron and synchrotron x-ray powder diffraction we have determined the ordered distribution of oxygen vacancies in PrOdelta planes. This order doubles both a and b lattice parameters from the perovskite cell parameter, forming a tetragonal (rather than orthorhombic) structure. On cooling, a paramagnetic to ferromagnetic and an incomplete ferromagnetic to antiferromagnetic transition take place. This second transition leads to a coexistence of ferromagnetic and antiferromagnetic order, forming a canted G-type antiferromagnetic structure. Magnetic data above the ferromagnetic transition evidence a large value of the effective paramagnetic moment of Co, implying that, well below room temperature, Co3+ ions in an octahedral environment present a high-spin state, in contrast to RBaCo2O5.5 cobaltites.
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页码：1 / 9
页数：9
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