High-sensitivity heat-capacity measurements on Sr₂RuO₄ under uniaxial pressure.

ABSTRACT: A key question regarding the unconventional superconductivity of [Formula: see text] remains whether the order parameter is single- or two-component. Under a hypothesis of two-component superconductivity, uniaxial pressure is expected to lift their degeneracy, resulting in a split transition. The most direct and fundamental probe of a split transition is heat capacity. Here, we report measurement of heat capacity of samples subject to large and highly homogeneous uniaxial pressure. We place an upper limit on the heat-capacity signature of any second transition of a few percent of that of the primary superconducting transition. The normalized jump in heat capacity, [Formula: see text], grows smoothly as a function of uniaxial pressure, favoring order parameters which are allowed to maximize

SUBMITTER: Li YS 

PROVIDER: S-EPMC7958258 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature