UNSPECIFIED (2000) Flux pinning, surface and geometrical barriers in YNi2B2C. In: 1st Euroconference on Vortex Matter in Superconductors at Extreme Scales and Conditions, SEP 18-24, 1999, IRAKLION, GREECE.

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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 (T-c approximate to 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 B-c2. On the other hand, for small applied fields close to H-c1, 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. (C) 2000 Elsevier Science B.V. All rights reserved.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QC Physics
Journal or Publication Title:	PHYSICA C
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0921-4534
Date:	May 2000
Volume:	332
Number:	1-4
Number of Pages:	5
Page Range:	pp. 173-177
Publication Status:	Published
Title of Event:	1st Euroconference on Vortex Matter in Superconductors at Extreme Scales and Conditions
Location of Event:	IRAKLION, GREECE
Date(s) of Event:	SEP 18-24, 1999
URI:	http://wrap.warwick.ac.uk/id/eprint/13362

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