Interorbital singlet pairing in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>RuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>: A Hund's superconductor
Stefan Käser, Hugo U. R. Strand, Nils Wentzell, Antoine Georges, Olivier Parcollet, P. Hansmann
Abstract
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.
Topics & Concepts
PairingSuperconductivitySinglet stateStrontiumPhysicsCondensed matter physicsCrystallographyChemistryQuantum mechanicsNuclear physicsExcited stateAdvanced Condensed Matter PhysicsPhysics of Superconductivity and MagnetismMagnetic and transport properties of perovskites and related materials