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Phys. Rev. B 74, 184521 (2006) [10 pages]

Effect of field-dependent core size on reversible magnetization of high- κ 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. Miranović
Department of Physics, University of Montenegro, 81000 Podgorica, Serbia and Montenegro

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

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

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.74.184521
DOI:
10.1103/PhysRevB.74.184521
PACS:
74.50.+r, 74.78.Fk

*Corresponding author. Electronic address: prozorov@ameslab.gov

 
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