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We discuss the quasiparticle entropy and heat capacity of a dirtysuperconductor-normal metal-superconductor junction. In the case of shortjunctions, the inverse proximity effect extending in the superconducting banksplays a crucial role in determining the thermodynamic quantities. In this case,commonly used approximations can violate thermodynamic relations betweensupercurrent and quasiparticle entropy. We provide analytical and numericalresults as a function of different geometrical parameters. Quantitativeestimates for the heat capacity can be relevant for the design of caloritronicdevices or radiation sensor applications.

Quasiparticle entropy in superconductor/normal metal/superconductor proximity junctions in the diffusive limit