skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Influence of the upper critical-field anisotropy on the transport properties of polycrystalline MgB{sub 2}

Abstract

The intrinsic properties of MgB{sub 2} form the basis for all applications of this superconductor. We wish to emphasize that the application range of polycrystalline MgB{sub 2} is limited by the upper critical field H{sub c2} and its anisotropy. In wires or tapes, the MgB{sub 2} grains are randomly oriented or only slightly textured and the anisotropy of the upper critical field leads to different transport properties in different grains, if a magnetic field is applied and the current transport becomes percolative. The irreversibility line is caused by the disappearance of a continuous superconducting current path and not by depinning as in high-temperature superconductors. Based on a percolation model, we demonstrate how the changes of the upper critical field and its anisotropy and how the changes of flux pinning will influence the critical currents of a wire or a tape. These predictions are compared to results of neutron irradiation experiments, where these parameters were changed systematically.

Authors:
; ;  [1]
  1. Atominstitut der Oesterreichischen Universitaeten, 1020 Vienna (Austria)
Publication Date:
OSTI Identifier:
20714026
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 98; Journal Issue: 3; Other Information: DOI: 10.1063/1.1997288; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANISOTROPY; CHARGED-PARTICLE TRANSPORT; CRITICAL CURRENT; CRITICAL FIELD; HIGH-TC SUPERCONDUCTORS; IRRADIATION; MAGNESIUM BORIDES; MAGNETIC FLUX; NEUTRONS; POLYCRYSTALS; WIRES

Citation Formats

Eisterer, M, Krutzler, C, and Weber, H W. Influence of the upper critical-field anisotropy on the transport properties of polycrystalline MgB{sub 2}. United States: N. p., 2005. Web. doi:10.1063/1.1997288.
Eisterer, M, Krutzler, C, & Weber, H W. Influence of the upper critical-field anisotropy on the transport properties of polycrystalline MgB{sub 2}. United States. https://doi.org/10.1063/1.1997288
Eisterer, M, Krutzler, C, and Weber, H W. 2005. "Influence of the upper critical-field anisotropy on the transport properties of polycrystalline MgB{sub 2}". United States. https://doi.org/10.1063/1.1997288.
@article{osti_20714026,
title = {Influence of the upper critical-field anisotropy on the transport properties of polycrystalline MgB{sub 2}},
author = {Eisterer, M and Krutzler, C and Weber, H W},
abstractNote = {The intrinsic properties of MgB{sub 2} form the basis for all applications of this superconductor. We wish to emphasize that the application range of polycrystalline MgB{sub 2} is limited by the upper critical field H{sub c2} and its anisotropy. In wires or tapes, the MgB{sub 2} grains are randomly oriented or only slightly textured and the anisotropy of the upper critical field leads to different transport properties in different grains, if a magnetic field is applied and the current transport becomes percolative. The irreversibility line is caused by the disappearance of a continuous superconducting current path and not by depinning as in high-temperature superconductors. Based on a percolation model, we demonstrate how the changes of the upper critical field and its anisotropy and how the changes of flux pinning will influence the critical currents of a wire or a tape. These predictions are compared to results of neutron irradiation experiments, where these parameters were changed systematically.},
doi = {10.1063/1.1997288},
url = {https://www.osti.gov/biblio/20714026}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 3,
volume = 98,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2005},
month = {Mon Aug 01 00:00:00 EDT 2005}
}