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Dipole Interaction in Triplet Superconductivity with Horizontal Line Nodes; Orientation of the Superconducting Order Parameter in Sr2RuO4

Yasumasa Hasegawa
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Abstract

Dipole interaction in the triplet superconductivity is studied. If the Cooper pairs are formed by the electrons at $\mib{r}$ and $\mib{r}+(\pm\frac{a}{2},\pm\frac{a}{2},\pm\frac{c}{2})$ in the body centered tetragonal lattice, (in this case the line nodes run horizontally on the cylindrical Fermi surface), the dipole energy is low when the ${\mib{d}}$-vector is perpendicular to the direction of the angular momentum of the Cooper pairs ($\mib{l}$-vector). This result is in contrast with the dipole energies in the ABM state of superfluid $^3$He, where $\mib{d}$-vector is forced to be parallel or antiparallel to the $\mib{l}$-vector by the dipole interaction. The recent NQR experiment in Sr$_2$RuO$_4$ by Ishida et al. can be explained by this result.

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Yasumasa Hasegawa. 2003-06-13. Dipole Interaction in Triplet Superconductivity with Horizontal Line Nodes; Orientation of the Superconducting Order Parameter in Sr2RuO4. https://doi.org/10.1143/jpsj.72.2456

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