Triple Perovskite CoSr2YCu2O7-δ and its Peculiar Structural Features: A Neutron Diffraction Study
Abstract
Samples of the composition CoSr2YCu2O7-δ (Co-1212) were synthesized in a single-phase form and studied using neutron diffraction (ND), chemical analyses and magnetization measurements. The structure of Co-1212 is best described in the space group Ima2 that yields good fit to the observed ND data. No cross-migration between Cu and Co is seen for Co-1212. The overall oxygen content, as determined from the refined oxygen occupancies, comes out to be around 7.0. This is close to the values determined from wet-chemical and thermogravimetric analyses. Unlike in Cu-1212, the complete reduction of Co-1212 in 5% H2/95% Ar atmosphere occurs in a single step, revealing that the amount of reversibly removable oxygen is considerably less than that in Cu-1212. Zero-field-cooled and field-cooled magnetizations, measured in an applied field of 100 Oe, show branching at around 30 K, presumably due to the magnetic ordering of Co moments. The present Co-1212 sample is found not to be superconducting down to 5 K. © 2002 Elsevier Science B.V. All rights reserved.
Recommended Citation
V. P. Awana et al., "Triple Perovskite CoSr2YCu2O7-δ and its Peculiar Structural Features: A Neutron Diffraction Study," Physica C: Superconductivity and its Applications, vol. 378 thru 381, no. PART 1, pp. 155 - 159, Elsevier, Oct 2002.
The definitive version is available at https://doi.org/10.1016/S0921-4534(02)01402-8
Department(s)
Physics
Keywords and Phrases
Co-1212 cuprate; Magnetization; Oxygen stoichiometry; Structural analysis
International Standard Serial Number (ISSN)
0921-4534
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Elsevier, All rights reserved.
Publication Date
01 Oct 2002
Comments
Ministry of Education, Culture, Sports, Science and Technology, Grant P-00128