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We present the first direct evidence for two-band superconductivity in thequasi-one dimensional chalcogenide Nb$_{2}$Pd$_{0.81}$S$_{5}$. Soft pointcontact spectroscopic measurements reveal Andreev reflection in thedifferential conductance $G$ in the zero-resistance superconducting (SC) statebelow $T_c$(=6.6~K). Multiple peaks in $G$ were clearly observed at 1.8~K andwere successfully explained by the two-band Blonder-Tinkham-Klapwijk model withtwo gaps $\Delta_{1}=0.48$~meV and $\Delta_{2}=1.05$~meV. Their evolution intemperature and magnetic field is consistent with the conventional BCS theory.The SC gap to $T_c$ ratio for $\Delta_1$ and $\Delta_2$ is 1.7 and 3.7, whichis similar to the weak coupling BCS prediction of 3.5. These resultsdemonstrate that the newly discovered niobium chalcogenide is a two-gapsuperconductor in the weak coupling limit.

Spectroscopic evidence for two-gap superconductivity in the quasi-one dimensional chalcogenide Nb$_{2}$Pd$_{0.81}$S$_{5}$