Local defect structure of Sr{sub 3}Co{sub 2}O{sub x}, 5.64 x 6.60 : evolution of crystallographic and magnetic states.
We have extended the structural and magnetic phase diagrams of the bilayer Ruddlesden-Popper phase Sr{sub 3}Co{sub 2}O{sub x} beyond previously reported limits of x {approx} 6.1 to x = 6.60. The room temperature crystal structure for the x = 6.60 material is orthorhombic with oxygen vacancies located in the apical position that links the two nominally CoO{sub 2} layers in the perovskite block. An antiferromagnetic ground state is converted to ferromagnetic by moderate magnetic fields and high-temperature magnetic susceptibility data indicate short-range ferromagnetic order. We have also studied the oxygen defect structure of Sr{sub 3}Co{sub 2}O{sub x} in the range 5.64 {le} x {le} 5.80. Oxygen vacancies are present in both the in-plane sites, as well as the linking apical site. Critically, this linking site is displaced significantly along {cflx Z} from its ideal position, creating a particularly short Co-O bond. Using a combination of neutron powder diffraction (NPD) data and crystal-chemical considerations, we provide a model of the local Co ion environments. Additionally, low-temperature NPD and magnetization data show that the magnetic ground state of these oxygen-deficient materials is a complex antiferromagnet, with considerable sensitivity to precise oxygen content.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 940685
- Report Number(s):
- ANL/MSD/JA-57542
- Journal Information:
- Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: 2006 Vol. 74; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
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