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Effects of Ni Substitution on the Superconducting and Raman Spectra in YBa2Cu4O8

  • N. Watanabe
  • N. Koshizuka
  • N. Seiji
  • H. Yamauchi
Conference paper

Abstract

The effects of Ni-substitution on YBa2Cu4O8 have been investigated by Raman scattering, X-ray diffraction, resistivity and susceptibility measurements. Samples of YBa2(Cu 1−xNi x )4O8 with x = 0 to 0.1 were prepared using a highoxygen-pressure technique. As the Ni content is increased, the lattice parameter of the a axis increases, but that of the c axis decreases. The structure of the YBa2(Cu 1−xNi x )4O8 samples remain orthorhombic up to the highest doping concentration. The superconducting transition temperature T c decreases monotonically with increasing Ni concentration for x<0.03, with a coefficient of -32 K/at.%. It is found that the linewidth of Cu(2) A g mode at 150 cm−1 increases, while the frequency of the axial stretching vibration of 0(4) at 500 cm−1 remains constant for increasing Ni concentration. These facts suggest that Ni atoms will preferentially occupy the Cu(2) sites. The depression of T c is also discussed based on this substitution model.

Keywords

Superconducting Transition Temperature Antiferromagnetic Correlation Chain Site Cu02 Plane Anti Ferromagnetic Spin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Tokyo 1995

Authors and Affiliations

  • N. Watanabe
    • 1
  • N. Koshizuka
    • 1
  • N. Seiji
    • 1
  • H. Yamauchi
    • 1
  1. 1.Superconductivity Research LaboratoryInternational Superconductivity Technology CenterKoto-ku, Tokyo 135Japan

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