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Low Temperature Scanning Tunneling Spectroscopy Studies of High J c NdBa2Cu3O7 − δ Single Crystals

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Abstract

We report low temperature scanning tunneling spectroscopy (STS) studies on NdBa2Cu3O7 − δ (Nd123) single crystals. Two characteristic spectra with a nearly ohmic background spectrum and a V-shaped background are observed on the cleaved surfaces. The former spectum shows an inhomogeneous distribution of a superconducting energy gap (2Δ) for STS differential conductance map. The latter shows a homogeneous distribution. It is probable that those differences are attributed to a tunneling current from different surface layers. The temperature dependence of tunneling conductance spectrum with a V-shaped background reveals that the superconducting gap disappears around T c, and no pseudogap behavior exists above T c.

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Authors and Affiliations

  1. Superconductivity Research Laboratory, ISTEC, Koto-ku, Tokyo, 135-0062, Japan

    M. Nishiyama, S. Shibata, N. Koshizuka & M. Murakami

  2. Materials and Structures Laboratory, Tokyo Institute of Technology, Midori-ku, Yokohama, 226-8503, Japan

    G. Kinoda & T. Hasegawa

Authors
  1. M. Nishiyama
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  2. G. Kinoda
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  3. S. Shibata
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  4. T. Hasegawa
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  5. N. Koshizuka
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  6. M. Murakami
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Nishiyama, M., Kinoda, G., Shibata, S. et al. Low Temperature Scanning Tunneling Spectroscopy Studies of High J c NdBa2Cu3O7 − δ Single Crystals. Journal of Superconductivity 15, 351–354 (2002). https://doi.org/10.1023/A:1021018129585

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