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Nd/Ba substitution and oxygen deficiency effects on the pinning properties of NdBa2Cu3O7-σ single crystals

Published online by Cambridge University Press:  18 March 2011

S. Shibata ,
K. Nakao ,
A. Yamamoto ,
Y. Feng ,
A.K. Pradhan ,
T. Machi  and
N. Koshizuka
S. Shibata
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo, 135-0062, Japan, Fax 81-3-3536-5717, [email protected]
K. Nakao
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo, 135-0062, Japan
A. Yamamoto
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo, 135-0062, Japan
Y. Feng
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo, 135-0062, Japan
A.K. Pradhan
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo, 135-0062, Japan
T. Machi
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo, 135-0062, Japan
N. Koshizuka
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo, 135-0062, Japan
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Abstract

We studied the origin of peak effect in the magnetic field dependence of Jc in NdBa2Cu3O7-σ single crystals. The single crystals were grown by the slow cooling method under various partial O2 pressures(PO2) (0.04∼1%) in Ar atmosphere. We found that the peak effect depends on PO2 and it disappears for the crystals grown under low PO2∼0.04%. This result demonstrates the important role of Nd/Ba substitution for the peak effect because it is known that the Nd/Ba substitution decreases with lowering PO2. We also investigated the role of oxygen vacancies in the peak effect for the crystals with different amount of Nd/Ba substitution. We found that the main cause of peak effect in fully oxygenated crystals is due to local low Tc regions caused by the Nd/Ba substitution rather than those by the oxygen vacancies.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 659: Symposium II – High-Temperature Superconductors-Crystal Chemistry, Processing & Properties , 2000 , II10.8
Copyright
Copyright © Materials Research Society 2001

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References

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