What is the superconducting order parameter of Sr_2RuO_4? · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title · changed
Revision 1: What is the superconducting order parameter of Sr2RuO4
Revision 2: What is the superconducting order parameter of $\mathrm{Sr_2RuO_4}$?
Plain · changed
Revision 1: The pairing pattern of Sr2RuO4 must explain conflicting data: some measurements suggest a two-part order that breaks time-reversal symmetry, while others see only one transition.
Revision 2: 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 · changed · core
Revision 1: Determine the order parameter of Sr2RuO4 ($T_c = 1.5\,\mathrm{K}$): 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.
Revision 2: 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.
Settled by
A single order parameter that quantitatively fits Knight shift, ultrasound, muSR, Kerr and strain-dependent heat capacity, confirmed by a phase-sensitive measurement.
Kind
well-posed
Answer type
identification
References
(empty)
Literature status
contested
Status note
(empty)
Posed since
1995

Decisions