Pinning of Josephson vortices in single crystals of Tl2Ba2CuO6+δ superconductors

F. Zuo, S. Khizroev, V. N. Kopylov, N. N. Kolesnikov

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Magnetic hysteresis measurements are performed on single crystals of Tl2Ba2CuO6+δ superconductors with field parallel to the ab-plane. Our results show anomalously the Bean type critical state behavior with constant critical current in this orientation. The penetration field Hp(T) depends on temperature T according to Hp = Hp (0) [1 - (T/Tc)2, in sharp contrast to Hp(T) with field in the axis c-axis direction. For samples with high transition temperatures, the magnetization undergoes abrupt changes as a function of field at low temperatures. We propose that pinnings on the Josephson vortices in this direction are due to structure defects in these crystals. A local variation in the tunneling distance will introduce a finite pinning on Josephson vortices moving along the ab-plane. The abrupt change in magnetization may be due to field induced decoupling of the Josephson interaction between the layers.

Original languageEnglish (US)
Pages (from-to)117-122
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume243
Issue number1-2
DOIs
StatePublished - Feb 20 1995

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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