Ultrasound evidence for a two-component superconducting order parameter in Sr${}_2$RuO${}_4$

S. Benhabib, C. Lupien, I. Paul +9

The quasi-2D metal Sr${}_2$RuO${}_4$ is one of the best characterized unconventional superconductors, yet the nature of its superconducting order parameter is still highly debated. Thi…