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Under GGA, the structural, electronic and magnetic properties of single-wall (8,8) GeC nanotubes filled with iron Fe n nanowires (n=5, 9, 13 and 21) have been investigated systematically using the first-principles PAW potential within DFT. We find that the initial shapes of the Fe 5 @(8,8), Fe 9 @(8,8) and Fe 13 @(8,8) systems are preserved without any visible changes...
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