What is the superconducting order parameter of $\mathrm{Sr_2RuO_4}$?
In plain words
The pairing pattern of $\mathrm{Sr_2RuO_4}$ must explain conflicting data: some measurements suggest a two-part order that breaks time-reversal symmetry, while others see only one transition.
Precise statement
Determine the order parameter of $\mathrm{Sr_2RuO_4}$ ($T_c = 1.5\,\mathrm{K}$): parity, spin structure, orbital and band content, and irreducible representation of D4h, consistent with the drop of the 17O Knight shift for in-plane fields (2019), the ultrasound jump in shear modulus $c66$ suggesting two components, muSR and polar Kerr time-reversal breaking, and no second heat-capacity anomaly under uniaxial stress. Candidates include d_xz + i d_yz, s' + i d_x2-y2, d + i g and interorbital pairing states.
What would settle it
A single order parameter that quantitatively fits Knight shift, ultrasound, muSR, Kerr and strain-dependent heat capacity, confirmed by a phase-sensitive measurement.
Problems built on this one
Special cases
- Location of gap nodes on the $\mathrm{Sr_2RuO_4}$ Fermi sheets · open
- Is time-reversal breaking in $\mathrm{Sr_2RuO_4}$ an intrinsic bulk property? · open
- Is the $\mathrm{Sr_2RuO_4}$ order parameter two-component? · open
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