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A Tunneling Study of Superconducting YBa2 Cu3Oy By Contact Junctions At 77 K

Published online by Cambridge University Press:  28 February 2011

H. Enomoto ,
K. Gotoh ,
K. Iida ,
Y. Takano ,
N. Mori  and
H. Ozaki
H. Enomoto
Affiliation:
Department of Electrical Engineering, Waseda University, Ohkubo 3–4–1, Shinjuku-ku, Tokyo 160, Japan
K. Gotoh
Affiliation:
Department of Electrical Engineering, Waseda University, Ohkubo 3–4–1, Shinjuku-ku, Tokyo 160, Japan
K. Iida
Affiliation:
Department of Electrical Engineering, Waseda University, Ohkubo 3–4–1, Shinjuku-ku, Tokyo 160, Japan
Y. Takano
Affiliation:
Department of Physics, Nihon University, Kanda-Surugadai 1–8, Chiyoda-ku, Tokyo 101, Japan
N. Mori
Affiliation:
Department of Electrical Engineering, Oyama National College of Technology, Ohaza-Nakakuki 771, Oyama 323, Japan
H. Ozaki
Affiliation:
Department of Electrical Engineering, Waseda University, Ohkubo 3–4–1, Shinjuku-ku, Tokyo 160, Japan
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Abstract

Giaever tunneling measurements have been applied to investigate the electronic structures of the high Tc superconductor YB2Cu3Oy near Tc. The superconducting energy gap of 17 meV was observed in V-dl/dv curve at 77 K. In the light of BCS model, 2Δ0Δ/kBTc was estimated as 3.3. Several dip structures were observed in the bias region up to 0.5 eV in V-dl/dV curve, using the 3rd derivative analysis. Through the temperature dependence, these structures were found to be associated with the superconductivity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 853
Copyright
Copyright © Materials Research Society 1988

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References

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