Kondo Resonance in Heavy Fermion System CeRu2Si2 Studied by Point-Contact Spectroscopy

Takuya Takahashi, Masanobu Shiga, Tsubasa Teramoto, Dai Aoki, Yoshichika Ōnuki, Tatsuya Kawae

Research output: Contribution to journalArticlepeer-review

Abstract

To examine the electronic density of state (DOS) in Kondo lattice (KL) system CeRu2Si2, we performed a point contact spectroscopy (PCS) investigation. At low temperatures, PCS spectra exhibit an asymmetric dip structure at zero-bias voltage, which can be reproduced by a theoretical model on electron tunneling spectra between a probe tip and localized moments. Moreover, below approximately 30 K, the dip depth increases logarithmically as the temperature decreases. These results indicate that the asymmetric dip structure originates from the Kondo resonance. Additionally, based on our estimate of the electron tunneling probability into a localized 4 f orbital, we propose that PCS can be used to study the evolution of the electronic DOS in KL systems.

Original languageEnglish
Article number023704
Journaljournal of the physical society of japan
Volume93
Issue number2
DOIs
Publication statusPublished - Feb 15 2024

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

Fingerprint

Dive into the research topics of 'Kondo Resonance in Heavy Fermion System CeRu2Si2 Studied by Point-Contact Spectroscopy'. Together they form a unique fingerprint.

Cite this