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We comment on a recent Letter by Waelti et al. (PRL 84, 5616 (2000)) on'Spectroscopic evidence for unconventional superconductivity in UBe13'. We show- by using the basic Wexler formula - that it is unlikely to observe Andreevreflection at point contacts between UBe13 and a normal metal. The largesuperconducting anomalies usually found for those contacts are mainly due tothe resistive Maxwell resistance vanishing below Tc of UBe13.Comment: 1 page, no figures, RevTeX, submitted to Phys. Rev. Let

physical review letters

Andreev Reflection at Point Contacts with Heavy-Fermion<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>UBe</mml:mi></mml:mrow><mml:mrow><mml:mn>13</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>?

Andreev Reflection at Point Contacts with Heavy-FermionUBe13?