Charge ordering in the layered Co-based perovskite HoBaCo2O5

被引：137

作者：

Suard, E

Fauth, F

Caignaert, V

Mirebeau, I

Baldinozzi, G

机构：

[1] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[2] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[3] ISMRA, Lab CRISMAT, F-14050 Caen, France

[4] Ctr Etud Saclay, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France

[5] Ecole Cent Paris, CNRS, Lab SPMS, F-92295 Chatenay Malabry, France

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.61.R11871

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

From neutron powder diffraction studies performed on the ordered oxygen deficient perovskite HoBaCo2O5, we have observed two structural phase transitions at T(N)similar to 340 K and T(CO)similar to 210 K, corresponding to the occurrence of magnetism and the onset of charge ordering, respectively. The charge ordered phase exhibits chains of Co2+ and Co3+ along the a axis and an alternate stacking of these ions along the b and c axes. The observed magnetic moments, mu(Co3+) = 37 mu(B) and mu(Co2+) = 2.7 mu(B), confirm this charge ordering and are in good agreement with the expected values for high-spin Co ions in pyramidal environment.

引用

页码：11871 / 11874

页数：4

共 21 条

[1] Magnetic and M-I Transitions in YBaCo2O5+x (O≤x≤0.5) [J].