Interband Coulomb Interaction and Horizontal Line Nodes in Triplet Superconductor Sr2RuO4
Abstract
A possible mechanism for the horizontal line nodes in triplet superconductor, Sr2RuO4, 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 qz2, resulting in the horizontal line nodes.
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