Point-contact spectroscopy of heavy fermion superconductors Ce2PdIn8and Ce3PdIn11in comparison with CeCoIn5

Lichang Yin; Liqiang Che; Tian Le; Ye Chen; Yongjun Zhang; Hanoh Lee; Daniel Gnida; Joe D Thompson; Dariusz Kaczorowski; Xin Lu

doi:10.1088/1361-648X/abed19

Point-contact spectroscopy of heavy fermion superconductors Ce₂PdIn₈and Ce₃PdIn₁₁in comparison with CeCoIn₅

J Phys Condens Matter. 2021 Apr 29;33(20). doi: 10.1088/1361-648X/abed19.

Authors

Lichang Yin¹, Liqiang Che¹, Tian Le¹, Ye Chen¹, Yongjun Zhang¹, Hanoh Lee², Daniel Gnida³, Joe D Thompson⁴, Dariusz Kaczorowski^{3

5}, Xin Lu^{1

6}

Affiliations

¹ Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, People's Republic of China.
² Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
³ Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw, Poland.
⁴ Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States of America.
⁵ Centre for Advanced Materials and Smart Structures, Polish Academy of Sciences, Okolna 2, 50-422 Wroclaw, Poland.
⁶ Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China.

PMID: 33690181
DOI: 10.1088/1361-648X/abed19

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.

Keywords: Fano-line; heavy fermion; hybridization; point-contact spectroscopy.