Flux pinning, surface and geometrical barriers in YNi2B2C

S. S. James*, C. D. Dewhurst, R. A. Doyle, D. Mck Paul, Y. Paltiel, E. Zeldov, A. M. Campbell

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

18 Scopus citations

Abstract

In the majority of the (RE)Ni2B2C family of superconductors (RE = Dy, Ho, Er, Tm, Y, Lu), a magnetic ordering of the RE moments (RE = Dy, Ho, Er, Tm) appears to directly influence the formation and structure of the vortex lattice as well as the weak residual flux pinning properties. To study the residual pinning in these materials, it is, therefore, necessary to investigate the non-magnetic members such as YNi2B2C or LuNi2B2C, without the influence of magnetic order. Here, we present data from local Hall probe and global magnetization measurements used to examine flux pinning and superconducting hysteresis in YNi2B2C (Tc≈15.8 K). At high fields, a pronounced peak effect in the magnetization indicates that bulk pinning becomes significant as the vortex lattice softens for fields approaching Bc2. On the other hand, for small applied fields close to Hc1, direct measurements of the local induction using linear micro-Hall probe arrays show dome-like field profiles, as expected when surface and geometrical barrier effects dominate the vortex behaviour over bulk pinning. We discuss the competing roles of weak residual bulk pinning and surface and geometrical barrier effects in YNi2B2C.

Original languageAmerican English
Pages (from-to)173-177
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume332
Issue number1
DOIs
StatePublished - May 2000
Externally publishedYes
Event1st Euroconference on Vortex Matter in Superconductors at Extreme Scales and Conditions - Crete, Greece
Duration: 18 Sep 199924 Sep 1999

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