Evidence from Tunneling Spectroscopy for a Quasi-One Dimensional Origin of Superconductivity in Sr2RuO4

Abstract

To establish the mechanism of unconventional superconductivity in Sr${}_2$RUO${}_4$, a prerequisite is direct information concerning the momentum-space structure of the energy gaps ${\Delta }_i(k)$, and in particular whether the pairing strength is stronger ("dominant") on the quasi-1D ($\alpha$ and $\beta$) or on the quasi-2D ($\gamma$) Fermi surfaces. We present scanning tunneling microscopy (STM) measurements of the density-of-states spectra in the superconducting state of Sr${}_2$RuO${}_4$ for $0.1T_C<T<T_C$, and analyze them, along with published thermodynamic data, using a simple phenomenological model. We show that our observation of a single superconducting gap scale with maximum value $2\Delta \approx 5T_C$ along with a spectral shape indicative of line nodes is consistent, within a weak-coupling model, with magnetically mediated odd-parity superconductivity generated by dominant, near-nodal Cooper pairing on the $\alpha$ and $\beta$ bands.

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