Point-Contact Spectroscopy Of Heavy Fermion Superconductors Ce2pdin8 And Ce3pdin11 In Comparison With Cecoin5

We report point-contact spectroscopy measurements on heavy fermion cousins CeCoIn5, Ce2PdIn8 and Ce3PdIn11 to systematically study the hybridization between f and conduction electrons. Below a temperature T*, the spectrum of each compound exhibits an evolving Fano-like conductance shape, superimposed on a sloping background, that suggests the development of hybridization between local f and itinerant conduction electrons in the coherent heavy fermion state below T*. We present a quantitative analysis of the conductance curves with a two-channel model to compare the tunneling process between normal metallic silver particles in our soft point-contact and heavy-fermion single crystals CeCoIn5, Ce2PdIn8 and Ce3PdIn11.