We report electron tunneling spectroscopy studies on single crystalline FeSi sample performed for the case of homogeneous tunnel junction contacts and for the case of counter electrodes made from Pt-Rh alloy. Our results reveal that while the tunneling spectroscopy in the configuration with Pt-Rh tip is preferably sensitive to the d-partial density of states and to the indirect energy gap, the FeSi-FeSi type of tunnel junction yields spectroscopic information on the c-partial density of states and on the direct gap in FeSi.
Categories: cond-mat.str-el