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We have used normal metal-insulator-superconductor tunnel junctions asthermometers at sub-Kelvin temperatures to study the electron-phonon (e-p)interaction in thin Aluminum films doped with Manganese, as a function ofManganese concentration. Mn in Al is known to be a Kondo impurity withextremely high Kondo temperature $T_K \sim$ 500 K, thus our results probe thee-p coupling in the fully spin compensated, unitary limit. The temperaturedependence of the e-p interaction is consistent with the existing theory fordisordered metals, however full theory including the Kondo effect has not beenworked out yet. The strength of the interaction decreases with increasingManganese concentration, providing a means to improve sensitivity of detectorsand efficiency of solid state coolers

Improving the performance of hot-electron bolometers and solid state coolers with disordered alloys