Anisotropy parameter for Bi2Sr2CaCu2O8+δ single crystal by magnetic torque measurements in high magnetic fields

Shuichi Kawamata, Kazuo Inoue, Kiichi Okuda, Takahiko Sasaki

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4 Citations (Scopus)

Abstract

The applied field dependence of the anisotropy parameter, γ, defined by the square root of the effective mass ratio for the layered superconductor Bi2Sr2CaCu2O8+δ single crystal has been obtained by the magnetic torque measurements in several static magnetic fields up to 210kOe at 52 and 69 K. Although γ has a huge value of larger than 200 for fields below 20kOe, it becomes less than 60 in 210kOe. It is considered that the huge γ in lower field is affected by the layered structure effect like the intrinsic pinning in addition to the irreversibility due to the flux pinning. The relatively small δ value in higher field reveals the actual effective mass anisotropy.

Original languageEnglish
Pages (from-to)437-440
Number of pages4
JournalPhysica B: Condensed Matter
Volume246-247
Publication statusPublished - 1998 May 29
Externally publishedYes

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Keywords

  • Anisotropy in superconducting vortex state
  • Bi-based high temperature superconductors
  • Magnetic torque measurements

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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