Crystal Structure and Ferromagnetic Component in Layered Perovskite Sr0.8Y0.2CoO2.65
- Authors: Troyanchuk I.O.1, Bushinsky M.V.1, Tereshko N.V.1, Sikolenko V.V.2, Ritter C.3
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Affiliations:
- Scientific–Practical Materials Research Centre, National Academy of Sciences of Belarus
- Joint Institute for Nuclear Research
- Institut Laue–Langevin
- Issue: Vol 64, No 6 (2019)
- Pages: 975-978
- Section: Nanomaterials and Ceramics
- URL: https://journals.rcsi.science/1063-7745/article/view/194358
- DOI: https://doi.org/10.1134/S1063774519060245
- ID: 194358
Cite item
Abstract
The crystal structure and magnetic state of Sr0.8Y0.2CoO2.65 layered perovskite have been studied using neutron diffraction and synchrotron radiation diffraction and measuring the magnetization. It is shown that the crystal structure in the temperature range of 90–375 K can be described within the framework of the monoclinic sp. gr. A2/m with a cell 4√2ap × 2√2ap × 4ap. The unit-cell parameter a is doubled (sp. gr. A2/m) below TN ≈ 375 K. The basic magnetic structure can be described as G-type antiferromagnetic ordering with cobalt ion magnetic moments of 2.7 µB and 1.7 µB in the anion-deficient CoO4+γ and stoichiometric CoO6 layers, respectively. Based on the magnetization measurements, the ferromagnetic component of cobalt ion magnetic moment amounts to 0.27 µB at 8 K. In both layers, the Co3+ ions are predominantly in the mixed low/high-spin state. The ferromagnetic component is assumed to be due to the orbital ordering in the CoO5 pyramids at TN and the ferromagnetic exchange coupling between CoO5 pyramids in anion-deficient layers.
About the authors
I. O. Troyanchuk
Scientific–Practical Materials Research Centre, National Academy of Sciences of Belarus
Email: tereshko@physics.by
Belarus, Minsk, 220072
M. V. Bushinsky
Scientific–Practical Materials Research Centre, National Academy of Sciences of Belarus
Author for correspondence.
Email: bushinsky@physics.by
Belarus, Minsk, 220072
N. V. Tereshko
Scientific–Practical Materials Research Centre, National Academy of Sciences of Belarus
Author for correspondence.
Email: tereshko@physics.by
Belarus, Minsk, 220072
V. V. Sikolenko
Joint Institute for Nuclear Research
Email: tereshko@physics.by
Russian Federation, Dubna, Moscow oblast, 141980
C. Ritter
Institut Laue–Langevin
Email: tereshko@physics.by
France, Grenoble, 38042 Cedex 9