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Point-contact spectroscopy of heavy fermion superconductors Ce2PdIn8and Ce3PdIn11in comparison with CeCoIn5
Lichang Yin1, Liqiang Che1, Tian Le1
1Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, People's Republic of China.
Abstract:
We report point-contact spectroscopy measurements on heavy fermion cousins CeCoIn5, Ce2PdIn8and Ce3PdIn11to systematically study the hybridization betweenfand conduction electrons. Below a temperatureT*, the spectrum of each compound exhibits an evolving Fano-like conductance shape, superimposed on a sloping background, that suggests the development of hybridization between localfand itinerant conduction electrons in the coherent heavy fermion state belowT*. 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, Ce2PdIn8and Ce3PdIn11.
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