  Using tunneling spectroscopy, we have measured the local electron energy
distribution function in the normal part of a superconductor-normal
metal-superconductor (SNS) Josephson junction containing an extra lead to a
normal reservoir. In the presence of simultaneous supercurrent and injected
quasiparticle current, the distribution function exhibits a sharp feature at
very low energy. The feature is odd in energy, and odd under reversal of either
the supercurrent or the quasiparticle current direction. The feature represents
an effective temperature gradient across the SNS Josephson junction that is
controllable by the supercurrent.
