Constraints on the superconducting state of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>Sr</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>RuO</mml:mtext><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> from elastocaloric measurements

Abstract

In the longstanding quest to determine the symmetry of the superconducting state of Sr${}_{2}$RuO${}_{4}$, this paper exploits recent elastocaloric experiments to narrow down the possibilities down to a handful of options. By analyzing the elastocaloric data, the authors show that a normal-state maximum in the entropy becomes a minimum in the superconducting state. Through modeling of the associated Lifshitz transition, they extract information about the momentum-space structure of the pairing gap function, yielding constraints on the viable pairing states.

Topics & Concepts