N
Najib Cheggour
Researcher at University of Colorado Boulder
Publications - 49
Citations - 1123
Najib Cheggour is an academic researcher from University of Colorado Boulder. The author has contributed to research in topics: Superconductivity & Flux pinning. The author has an hindex of 18, co-authored 46 publications receiving 1031 citations. Previous affiliations of Najib Cheggour include Durham University & National Institute of Standards and Technology.
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Reversible axial-strain effect and extended strain limits in Y-Ba-Cu-O coatings on deformation-textured substrates
Najib Cheggour,John (Jack) W. Ekin,C.C. Clickner,Darren Verebelyi,Cornelis Leo Hans Thieme,Ron Feenstra,Amit Goyal +6 more
TL;DR: In this article, the authors measured the axial tensile tensile strain of YBa2Cu3O7−δ (YBCO) coatings on buffered, deformation-textured substrates of pure Ni, Ni-5-at.
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Reversible axial-strain effect in Y Ba Cu O coated conductors
Najib Cheggour,John (Jack) W. Ekin,Cornelis Leo Hans Thieme,Y Y. Xie,Venkat Selvamanickam,Ron Feenstra +5 more
TL;DR: In this paper, the reversible strain effect in Y?Ba?Cu?O (YBCO) coated conductors contrasts with the general understanding that the effect of strain on the critical-current density Jc in practical high-temperature superconductors is determined only by crack formation in the ceramic component.
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Mechanical properties of pure Ni and Ni-alloy substrate materials for Y–Ba–Cu–O coated superconductors
C.C. Clickner,John (Jack) W. Ekin,Najib Cheggour,Cornelis Leo Hans Thieme,Y. Qiao,Y.-Y. Xie,Amit Goyal +6 more
TL;DR: In this paper, rolling-assisted, biaxially-textured substrates (RABiTS) and substrates for ion-beam assisted deposition (IBAD) coated superconductors are measured at room temperature, 76, and 4 K. Results obtained are intended to serve as a database of mechanical properties of substrates having the same anneal state and texture as those incorporated in the general class of RE-Ba-Cu-O coated conductor composites.
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A probe for investigating the effects of temperature, strain, and magnetic field on transport critical currents in superconducting wires and tapes
TL;DR: In this article, a variable-temperature probe has been developed to study the effect of strain on the transport properties of superconducting wires and tapes in high magnetic fields, by soldering it to a thick coiled spring and twisting one end of the spring with respect to the other.
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Magnetic-field dependence of the reversible axial-strain effect in Y-Ba-Cu-O coated conductors
TL;DR: In this paper, the critical current density of an yttrium-barium-copperoxide (YBCO) coated conductor was measured at 76.5 K as a function of axial tensile strain /spl epsiv/ and magnetic field B applied parallel to the YBCO (a,b) plane.