Interband Coulomb Interaction and Horizontal Line Nodes in Triplet Superconductor Sr$_2$RuO$_4$

Details Interband Coulomb Interaction and Horizontal Line Nodes in Triplet Superconductor Sr$_2$RuO$_4$ Interband Coulomb Interaction and Horizontal Line Nodes in Triplet Superconductor Sr$_2$RuO$_4$

2003-03-13

arxiv.org/abs/cond-mat/0303238v1

J. Phys. Soc. Jpn. 72, 1318 (2003).

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1143/JPSJ.72.1318

A possible mechanism for the horizontal line nodes in triplet superconductor, Sr$_2$RuO$_4$, is proposed. We consider the interlayer Coulomb interaction, as well as the on-site Coulomb repulsion, between electrons in different bands. In the second order perturbation in the interband interaction, the effective interaction becomes dependent on $\cos \frac{q_z}{2}$, resulting in the horizontal line nodes.

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