Irreversibility line and second peak in the magnetization curves of Pb2Sr2Y1-xCaxCu3O 8 single crystals

T. Noji, T. Takabayashi, T. Nishizaki, N. Kobayashi, Y. Koike

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3 Citations (Scopus)

Abstract

The irreversibility field Hirr and the anomalous second peak in the magnetization curves have been studied from the magnetization measurements (H ∥ c-axis) for Pb2Sr2Y1-xCaxCu3O 8 single crystals with 0 ≦ x ≦ 0.5 and with the anisotropic parameter γ = (m*c/m*ab)1/2 of 24 ≧ γ ≧ 5. The temperature dependence of Hirr is discussed in terms of flux creep and 2D or 3D vortex-lattice melting. The anomalous second peak is observed for all x values. The peak shape is similar to that of YBa2Cu3O7-δ. The peak field Hp is dependent on temperature and proportional to (1 - T/Tc)3/2 near Tc. Both Hirr and Hp at each reduced temperature are proportional to γ-2. The origin of the second peak is discussed in terms of dimensional crossover of the vortices from 3D to 2D and collective pinning.

Original languageEnglish
Pages (from-to)442-445
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume263
Issue number1-4
DOIs
Publication statusPublished - 1996 May

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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