Effect of field-dependent core size on reversible magnetization of high- superconductors

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V. G. Kogan, R. Prozorov, S. L. Bud'ko, and P. C. Canfield
Ames Laboratory—DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

J. R. Thompson
Materials Science and Technology Division, ORNL, Oak Ridge, Tennessee 37831, USA and Department of Physics, University of Tennessee, Knoxville, Tennessee 3796-1200, USA

J. Karpinski and N. D. Zhigadlo
Solid State Physics Laboratory, ETH, 8093 Zurich, Switzerland

P. Miranovi

Department of Physics, University of Montenegro, 81000 Podgorica, Serbia and Montenegro

Received 21 June 2006; revised 11 September 2006; published 15 November 2006

Thefield dependence of the vortex core size (B) is incorporatedin the London model, in order to describe reversible magnetizationM(B,T) for a number of materials with large Ginzburg-Landau parameter kappa . The dependence (B) is directly related to deviations inM(ln B) from linear behavior prescribed by the standard London model.A simple method to extract (B) from the magnetization datais proposed. For most materials examined, (B) so obtained decreaseswith increasing field and is in qualitative agreement both withbehavior extracted from µSR and small-angle neutron-scattering data and withthat predicted theoretically.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.184521
DOI:	10.1103/PhysRevB.74.184521
PACS:	74.50.+r; 74.78.Fk 74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects in superconductors 74.78.Fk Superconducting multilayers, superlattices, heterostructures YEAR: 2006
KEYWORDS:	high-temperature superconductors, magnetisation reversal, Ginzburg-Landau theory, penetration depth (superconductivity), muon probes, flux flow, neutron diffraction

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