3 research outputs found
High Tc superconductivity at a critical strain and charge density in diborides
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).Comment: 10 page