Magnetic phase diagram of Josephson vortices in strongly anisotropic superconductor Bi-2212

Kazuto Hirata, Shuuichi Ooi, El Hadi Sadki, Takashi Mochiku

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

Magnetic phase diagram of Josephson vortices in strongly anisotropic superconductor Bi2Sr2CaCu2O8+δ has been studied by measuring the Josephson-vortex flow resistance. A triangular-lattice phase, in which periodic oscillations of the flow resistance have been observed, was found to start from about 6 kOe, independent of temperature. Although the triangular lattice phase exists over 7 T below 30 K, at higher temperatures the boundary to the others (glass phase) decreases with increasing temperature, and drops suddenly at 80 K. The flow resistance also decreases close to the boundary. These facts indicate that the thermal excitation of pancake vortex-antivortex pairs or missing a long-range order in the triangular lattice along the c-axis causes the reduction of the flow resistance. Furthermore, above the triangular lattice phase there finds some change in the flow resistance, which suggests the existence of a different kind of glass phases in the Josephson-vortex system.

Original languageEnglish
Pages (from-to)539-540
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume408-410
Issue number1-4
DOIs
Publication statusPublished - Aug 2004
Externally publishedYes
EventProceedings of the International Conference on Materials - Rio de Janeiro, Brazil
Duration: May 25 2003May 30 2003

Keywords

  • BiSrCaCuO
  • Flow resistance
  • Josephson-vortex
  • Magnetic phase diagram

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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