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Applied Physics Letters / Volume 84 / Issue 16 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 84, 3109 (2004); http://dx.doi.org/10.1063/1.1713031 (3 pages)

Effect of sample size on magnetic Jc for MgB2 superconductor

J. Horvat, S. Soltanian, X. L. Wang, and S. X. Dou

Institute for Superconducting and Electronic Materials, University of Wollongong, New South Wales 2522, Australia

(Received 16 September 2003; accepted 26 February 2004)

A strong effect of sample size on magnetic Jc(H) was observed for bulk MgB2 when Jc is obtained directly from the critical state model. Thus obtained zero-field Jc (Jc0) decreases strongly with the sample size, attaining a constant value for the samples larger than a few millimeters. On the other hand, the irreversibility field (Hirr) defined at Jc = 100 A/cm2 increases with the sample size. The decrease of Jc0 is described in terms of voids in the bulk MgB2 samples and superconducting screening around the cells of superconducting material between these voids (35 μm), because of concentration of the current in the narrow bridges connecting the cells. For samples larger than a few millimeters, the value of magnetic Jc is in agreement with the transport Jc and it is restricted by the voids. The critical state model is not suitable for obtaining Jc for small bulk MgB2. The increase of Hirr with the sample size is an artifact of defining Hirr by the value of Jc at which an additional superconducting screening on 1 μm scale dominates Δm. © 2004 American Institute of Physics.

© 2004 American Institute of Physics

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KEYWORDS and PACS

Keywords

magnesium compounds, type II superconductors, critical current density (superconductivity)

PACS

  • 74.25.Sv

    Critical currents

  • 74.70.Ad

    Metals; alloys and binary compounds (including A15, MgB2, etc.)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1713031

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    P. C. Canfield, D. K. Finnemore, S. L. Bud'ko, J. E. Ostenson, G. Laperot, C. E. Cunningham, and C. Petrovic, Phys. Rev. Lett. 86, 2423 (2001).

    G. Grasso, A. Malagoli, C. Ferdeghini, S. Roncallo, V. Bracinni, M. R. Cimberle, and A. S. Sirri, Appl. Phys. Lett. 79, 230 (2001)APPLAB000079000002000230000001.

    H. L. Suo, C. Beneduce, M. Dhalle, N. Musolino, J. Genoud, and R. Flükiger, Appl. Phys. Lett. 79, 3116 (2001)APPLAB000079000019003116000001.

    S. Li, O. Prabhakar, T. T. Tan, C. Q. Sun, X. L. Wang, S. Soltanian, J. Horvat, and S. X. Dou, Appl. Phys. Lett. 81, 874 (2002)APPLAB000081000005000874000001.


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