Formation of non-unitary state near the upper-critical field of Sr${}_2$RuO${}_4$

Masafumi Udagawa, Youichi Yanase, Masao Ogata

We have studied the superconducting state of Sr${}_2$RuO${}_4$ under a magnetic field parallel to the superconducting plane. We show that due to a weak spin-orbit coupling, non-unitary…