Nonstoichiometry, Defects and Transport Properties in MgB2

Details Nonstoichiometry, Defects and Transport Properties in MgB2 Nonstoichiometry, Defects and Transport Properties in MgB2

2001-05-24

arxiv.org/abs/cond-mat/0105478v1

Physics

Condensed Matter

Superconductivity

9 pages, 10 figures, submitted to Phys. Rev. B (May 24, 2001)

Scientific paper

10.1016/S0921-4534(02)01163-2

The local composition Mg:B of MgB2 powder was systematically changed through annealing. Correlations were observed between the Mg loss and the lattice parameters a/c and the microstrain of MgB2. Direct wavelength-dispersive-spectrum and XRD measurements on ceramic samples with different residual resistivity ratios suggested that the transport property of MgB2 might be affected by this Mg-deficiency, but oxygen-related defects may play a more important role.

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