Evidence for even parity unconventional superconductivity in Sr${}_2$RuO${}_4$

Aaron Chronister, Andrej Pustogow, Naoki Kikugawa +6

Unambiguous identification of the superconducting order parameter symmetry of Sr${}_2$RuO${}_4$ has remained elusive for more than a quarter century. While a chiral $p$-wave ground sta…