Absence of ${}^{17}$O Knight-Shift Changes across the First-Order Phase Transition Line in Sr${}_2$RuO${}_4$

Masahiro Manago, Kenji Ishida, Zhiqiang Mao +1

We performed ${}^{17}$O nuclear magnetic resonance measurements on superconducting (SC) Sr${}_2$RuO${}_4$ under in-plane magnetic fields. We found that no new signal appears in the SC st…