Interorbital singlet pairing in Sr2RuO4 : A Hund's superconductor

Strontium ruthenate (Sr${}_{2}$RuO${}_{4}$) has become one of the cornerstone compounds in research on correlated electron materials. While the room-temperature Hund's metal phase is rather well understood, the low-temperature superconductivity remains contested. By confronting state-of-the-art quantum many-body calculations with a great variety of experiments, the authors claim here that there is reason to believe that also the superconducting instability of Sr${}_{2}$RuO${}_{4}$ is driven by interorbital spin fluctuations, which at ${T}_{c}$ turn the Hund's metal into a Hund's superconductor.