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We present evidence for the cooling of normal metal phonons by electrontunneling in a Superconductor - Normal metal - Superconductor tunnel junction.The normal metal electron temperature is extracted by comparing the devicecurrent-voltage characteristics to the theoretical prediction. We use aquantitative model for the phonon cooling that includes the electron-phononcoupling in the normal metal and the Kapitza resistance between the substrateand the metal. It gives an excellent fit to the data and enables us to extractan effective phonon temperature in the normal metal.Comment: 4 pages, 5 figure

Electron and Phonon Cooling in a Superconductor–Normal-Metal–Superconductor Tunnel Junction