Edge dislocation and superstructure in MgB2 superconducting crystals

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Hexagonal plate-shaped MgB2 crystals have been prepared at ambient pressure. A superconducting transition has been observed at 37 K with a large transition width of ΔTc~22 K. The lattice strain (0.7%) is calculated from the FWHM of XRD data. Both an edge dislocation with Burgers vector b = -a, and a Mg (nano-agglomerate) self-ordering superstructure with lattice constant 2a0 have been directly detected in the [001] direction by HRTEM. The very broad transition may be caused by these defects in the crystals.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/0953-2048/18/11/018

Publication date: November 1, 2005

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