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Based upon the currently predominant theory of Fe-based superconductors, theorder parameter symmetry is the nodaless s\pm-wave. Andreev conductanceinvolving normal metals and such superconductors does not have a zero biasconductance peak (ZBCP) except maybe for a very narrow range of ajunction-dependent fitting parameter. We have measured differential conductanceof the in-plane boundary junctions between Au and superconducting FeSe0.3Te0.7films. The Au/FeSe0.3Te0.7 ramp-type junctions are fabricated with the biascurrent direction along the <110> axis of the epitaxial FeSe0.3Te0.7 film. Wehave always observed a pronounced ZBCP as well as some gap-like features in theconductance spectra of all samples studied, thus our experimental resultssuggest not the s\pm-wave theory but the possible existence of a nodal pointaround 45{\deg} in at least one of the gaps in FeSe0.3Te0.7 superconductor.

Zero-bias conductance peak observed in Au/FeSe0.3Te0.7 ramp-type junctions and its implication on the superconducting order parameter