T1 anomaly in AgSn proximity-effect bridges under phonon injection

We have observed that steady state heater phonon pumping into AgSn proximity-effect bridges causes a systematic reduction of the bridge critical current. Below T_λ, our results deviate anomalously from predictions of Parker's T¹ model though both above and below T_λ the injection-induced transition to the normal state appears continuous. Further, below T_λ, bridges underlaid with a thin-film of germanium exhibit a discontinuous injection induced transition to the normal state. We discuss possible implications.