High Tc superconductivity at a critical strain and charge density in diborides

Details High Tc superconductivity at a critical strain and charge density in diborides High Tc superconductivity at a critical strain and charge density in diborides

2001-02-22

arxiv.org/abs/cond-mat/0102410v4

S Agrestini et al 2001 J. Phys.: Condens. Matter 13 11689

Physics

Condensed Matter

Superconductivity

10 pages

Scientific paper

10.1088/0953-8984/13/50/328

We report variation of lattice structure in diborides (AB2) with different A atoms to identify the special case of MgB2 showing high Tc superconductivity. High purity MgB2 (Tc~39 K) has been prepared by direct reaction of the elements and the lattice parameters are measured by x-ray diffraction determining the strain e of the B-B distance. The results show that the superconductivity in these intermetallics appear near a critical point in a two variables (strain and charge density) phase diagram at (ec, rc).

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