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We have investigated how the Andreev-reflection hole current at ballisticpoint contacts responds to a large bias voltage. Its strong suppression couldbe explained by the drag excerted by the non-equilibrium phonon wind generatedby high-energy electrons flowing through the contact. The hole - phononinteraction leads to scattering lengths of the low-energetic holes down to100\,nm, thereby destroying the coherent retracing of the electron path by theAndreev-reflected holes.

Phonon-drag induced suppression of the Andreev hole current in superconducting niobium contacts