The loss of anisotropy in MgB2 with Sc substitution and its relationship with the critical temperature

Details The loss of anisotropy in MgB2 with Sc substitution and its relationship with the critical temperature The loss of anisotropy in MgB2 with Sc substitution and its relationship with the critical temperature

2005-04-20

arxiv.org/abs/cond-mat/0504495v2

J. Phys: Condens. Matter 18 (2006) 1403-1412

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1088/0953-8984/18/4/024

The electrical conductivity anisotropy of the sigma-bands is calculated for the (Mg,Sc)B2 system using a virtual crystal model. Our results reveal that anisotropy drops with relatively little scandium content (< 30%); this behaviour coincides with the lowering of Tc and the reduction of the Kohn anomaly. This anisotropy loss is also found in the Al and C doped systems. In this work it is argued that the anisotropy, or 2D character, of the sigma-bands is an important parameter for the understanding of the high Tc found in MgB2.

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