Repulsion and attraction in high Tc superconductors

Details Repulsion and attraction in high Tc superconductors Repulsion and attraction in high Tc superconductors

2010-12-21

arxiv.org/abs/1012.4543v2

Physics

Condensed Matter

Superconductivity

4 pages, 5figures

Scientific paper

10.1007/s10948-011-1167-8

The influence of repulsion and attraction in high-Tc superconductors to the gap functions is studied. A systematic method is proposed to compute the gap functions using the irreducible representations of the point group. It is found that a pure s-wave superconductivity exists only at very low temperatures, and attractive potentials on the near shells significantly expand the gap functions and increase significantly the critical temperature of superconductivity. A strong on-site repulsion drives the $A_{1g}$ gap into a $B_{1g}$ gap. It is expected that superconductivity with the $A_{1g}$ symmetry reaches a high critical temperature due to the cooperation of the on-site and the next-nearest neighbor attractions.

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