Abstract
The effect of comparatively weak actions on the structure of the two-gap BCS superconductor MgB2 was studied. The MgB2 samples studied differed in terms of the annealing time at 900°C. It was found that the lattice parameters, residual resistivity, and critical temperature depend only weakly on the annealing time, whereas the electrical resistivity decreases by a few times when the annealing time is increased from 2 to 10 h. It is assumed that the observed effects may be caused by the influence of Mg and B atom ordering in the MgB2 lattice on charge transfer over the two-dimensional B-B σ bonds.
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Translated from Fizika Tverdogo Tela, Vol. 47, No. 9, 2005, pp. 1546–1551.
Original Russian Text Copyright © 2005 by Blinkin, Derevyanko, Golovin, Sukhareva, Finkel’.
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Blinkin, A.A., Derevyanko, V.V., Golovin, V.N. et al. Evolution of the structure and properties of the MgB2 superconductor under isothermal annealing. Phys. Solid State 47, 1605–1610 (2005). https://doi.org/10.1134/1.2045341
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DOI: https://doi.org/10.1134/1.2045341