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Journal of Superconductivity

, Volume 9, Issue 1, pp 65–71 | Cite as

Anisotropy in the resistive superconducting transition under magnetic fields in single crystal Pb2Sr2Ho0.5Ca0.5Cu3O8

  • Takashi Noji
  • Yoji Koike
  • Hideo Iwasaki
  • Masatsune Kato
  • Norio Kobayashi
  • Yoshitami Saito
Article

Abstract

Anisotropie properties of the single crystal Pb2Sr2Ho0.5Ca0.5Cu3O8 have been investigated by measuring the electrical resistivity in theab-planeρ ab (H, θ,T), which depends on the angleθ between theab-plane and the magnetic-field direction, in various constant fieldsH perpendicular to the current direction. All the angle-dependent values ofρ ab (H, θ,T) at a constant temperature are scaled to be on one curve as a function of reduced field. The anisotropic parameter γ≡(m c * /m ab * )1/2 is estimated as 12–13, which is larger than that of YBa2Cu3O7 and much smaller than that of Bi2Sr2CaCu2O8. It has been concluded that the anisotropy does not always depend on the thickness of the blocking layer but seems to depend on the overlap of the electronic wave functions along thec-axis. Anisotropy in the pinning potential has also been discussed from the resistive tail in the temperature dependence ofρ ab (H,θ,T).

Key words

High-Tc superconductivity Pb2Sr2Ho0.5Ca0.5Cu3O8 single crystal upper critical magnetic field anisotropy 

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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • Takashi Noji
    • 1
  • Yoji Koike
    • 1
  • Hideo Iwasaki
    • 2
  • Masatsune Kato
    • 1
  • Norio Kobayashi
    • 2
  • Yoshitami Saito
    • 1
  1. 1.Department of Applied Physics, Faculty of EngineeringTohoku UniversitySendaiJapan
  2. 2.Institute for Materials ResearchTohoku UniversitySendaiJapan

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