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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