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The Impurity Effects on the Superconducting Gap in the High- T c Superconductor Bi2Sr2CaCu2−x Fe x O 8 + δ Investigated by STM/STS

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Abstract

We performed scanning tunneling microscopy/ spectroscopy (STM/STS) experiments to investigate Fe substitution effects on the superconductivity (SC) of overdoped Bi2212. The gap-edge peaks in STS spectrum at T≪T c become inhomogeneous strongly in Fe-doped Bi2212. The spectral weight around zero bias, namely the density of states (DOS) at ∼E F is partly recovered by substitution of Fe in every position. The recovery of the DOS at ∼E F can be explained in terms of impurity effects on d-wave SC in the unitarity limit. However, the strong inhomogeneity of gap-edge peaks would be ascribed to different effects due to Fe-substitution.

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Acknowledgments

Rotary Yoneyama Memorial Foundation and the Muroran Rotary Club for the financial support. This work was also supported by JSPS KAKENHI Grant Number 26400343.

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Authors and Affiliations

  1. Department of Applied Sciences, College of Design and Manufacturing Technology, Muroran Institute of Technology, Muroran, 050-8585, Hokkaido, Japan

    N. Momono, Y. Amakai & H. Takano

  2. Devision of Physics, Hokkaido University, Sapporo, 060-0810, Hokkaido, Japan

    T. Kurosawa, M. Oda & M. Ido

  3. Division of Chemical and Material Engineering, Muroran Institute of Technology, Muroran, 050-8585, Hokkaido, Japan

    S. Baar

  4. Division of Production Systems Engineering, Muroran Institute of Technology, Muroran, 050-8585, Hokkaido, Japan

    K. Kawamura, Y. Kobayashi, S. Iwasaki & T. Sakawaki

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  1. S. Baar
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  2. N. Momono
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  3. K. Kawamura
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  4. Y. Kobayashi
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  5. S. Iwasaki
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  6. T. Sakawaki
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  7. Y. Amakai
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  8. H. Takano
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  9. T. Kurosawa
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  10. M. Oda
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  11. M. Ido
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Correspondence to N. Momono.

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Baar, S., Momono, N., Kawamura, K. et al. The Impurity Effects on the Superconducting Gap in the High- T c Superconductor Bi2Sr2CaCu2−x Fe x O 8 + δ Investigated by STM/STS. J Supercond Nov Magn 29, 659–662 (2016). https://doi.org/10.1007/s10948-015-3320-2

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  • DOI: https://doi.org/10.1007/s10948-015-3320-2

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