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Microstructural features and superconducting properties of Mn-doped YBa2Cu3O7−δ

Published online by Cambridge University Press:  03 March 2011

Indu Dhingra ,
S.C. Kashyap  and
B.K. Das
Indu Dhingra
Affiliation:
Division of Materials, National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi-110012, India
S.C. Kashyap
Affiliation:
Department of Physics, I.I.T, Hauz Khas, New Delhi−110012, India
B.K. Das
Affiliation:
Division of Materials, National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi-110012, India
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Abstract

Small additions of MnO2 up to 15 at. % in YBa2Cu3O7−δ in place of Cu have been carried out to study their influence on the superconducting properties. It has been found that transition temperature and microstructure of Mn-doped samples are highly sensitive to the sintering temperature and Mn content. The normal state resistance increases with Mn content. Microstructure shows plate-like grain growth for low Mn contents (up to x = 0.05) at higher sintering temperature. XRD and microstructure reveals the presence of additional Y2BaCuO5 and Ba3Mn2O8 phases with an increase in Mn content. Also, reduction in the diamagnetic signal and broadening of transition is observed beyond certain Mn content. A detailed discussion of microstructure, XRD, normalized resistance, and magnetic properties has been carried out in correlation with sintering temperature and Mn content.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 11 , November 1994 , pp. 2771 - 2777
Copyright
Copyright © Materials Research Society 1994

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References

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