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Ordering of Oxygen Atoms in YBA2CU3O6+X and its Effects on Superconducting Properties

Published online by Cambridge University Press:  28 February 2011

Keikichi Nakamura ,
Takeshi Hatano ,
Shozo Ikeda  and
Keiichi Ogawa
Keikichi Nakamura
Affiliation:
National Research Institute for Metals, 2–3–12 Nakameguro, Meguroku Tokyo 153, Japan
Takeshi Hatano
Affiliation:
National Research Institute for Metals, 2–3–12 Nakameguro, Meguroku Tokyo 153, Japan
Shozo Ikeda
Affiliation:
National Research Institute for Metals, 2–3–12 Nakameguro, Meguroku Tokyo 153, Japan
Keiichi Ogawa
Affiliation:
National Research Institute for Metals, 2–3–12 Nakameguro, Meguroku Tokyo 153, Japan
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Abstract

Ordering of oxygen atoms in YBa2Cu3O6+x has been analysed by employing statistical thermodynamics ana the results are compared with the experimental data. The axial lengths a and b at room temperature were determined experimentally as a function of oxygen content and were found to show good agreement with the calculated lengths a and b. Special care was taken in the above experiment to dope oxygen atoms into the sample at low temperatures, typically 400° C. The superconducting transition temperature of the sample doped with oxygen at 400°C(starting material:YBa2Cu3O6.1.(decreases linearly with decreasing the oxygen content from 6+x=6.9(92 K) to 6.38(30 K) and decreased sharply around 6+x=6.35(5 K). No distinct superconducting phase corresponding to further ordered orthorhombic phase has been observed in this case.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 579
Copyright
Copyright © Materials Research Society 1988

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References

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