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Andreev reflection at the normal-metal/heavy-fermion superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Ce</mml:mi><mml:mi>Co</mml:mi><mml:msub><mml:mi>In</mml:mi><mml:mo>5</mml:mo></mml:msub></mml:mrow></mml:math>interface
The dynamic conductance of the heavy-fermion superconductor CeCoIn$_5$ is measured by point-contact spectroscopy as a function of temperature from 60 K down to 400 mK. The contact between the gold tip and the single-crystal is shown to be in the Sharvin limit with the enhanced sub-gap conductance arising from Andreev …