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Point-contact Andreev reflection spectroscopy was performed on singlecrystals of the heavy-fermion superconductor PrOs$_{4}$Sb$_{12}$, down to 90mKand up to 3Tesla. The conductance spectra showed multiple structures, includingzero-bias peaks and spectral dips, which are interpreted as signatures ofmultiple pairing gaps, one clearly having nodes. Samples with 2% Ru replacingOs were also measured, showing pronounced spectral humps consistent with theemergence of a non-nodal gap. Detailed analysis of the spectral evolutionrevealed a magnetic field-\emph{vs.}-temperature phase diagram forPrOs$_{4}$Sb$_{12}$ characterized by two distinct superconducting orderparameters.

Andreev reflection spectroscopy on the heavy-fermion superconductor  PrOs$_{4}$Sb$_{12}$: Microscopic evidence for multiple superconducting order  parameters