Is the Sr_2RuO_4 order parameter two-component? · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title · changed
Revision 1: Is the Sr2RuO4 order parameter two-component
Revision 2: Is the $\mathrm{Sr_2RuO_4}$ order parameter two-component?
Plain
If the order parameter has two parts, squeezing the crystal along one axis should split the superconducting transition into two; one probe sees a split and another does not.
Precise · changed · core
Revision 1: Determine whether uniaxial stress along $[100]$ splits $T_c$ of Sr2RuO4 into two thermodynamic transitions, as a two-component order parameter (multidimensional representation or accidental degeneracy) requires. An answer is a thermodynamic detection of the second transition, or a bound on its specific-heat jump below the value predicted by models fitted to the ultrasound data.
Revision 2: Determine whether uniaxial stress along $[100]$ splits $T_c$ of $\mathrm{Sr_2RuO_4}$ into two thermodynamic transitions, as a two-component order parameter (multidimensional representation or accidental degeneracy) requires. An answer is a thermodynamic detection of the second transition, or a bound on its specific-heat jump below the value predicted by models fitted to the ultrasound data.
Settled by
Calorimetry or elastocaloric measurements under stress with sensitivity below the predicted second-jump size, on the same samples used for muSR.
Kind
well-posed
Answer type
yes-no
References
(empty)
Literature status
contested
Status note
muSR under stress (2021) reported split onsets of superconductivity and time-reversal breaking, while heat capacity under stress found no second transition above a few percent of the main anomaly.
Posed since
(empty)

Decisions