TY - JOUR
T1 - Kondo Resonance in Heavy Fermion System CeRu2Si2 Studied by Point-Contact Spectroscopy
AU - Takahashi, Takuya
AU - Shiga, Masanobu
AU - Teramoto, Tsubasa
AU - Aoki, Dai
AU - Ōnuki, Yoshichika
AU - Kawae, Tatsuya
N1 - Publisher Copyright:
©2024 The Physical Society of Japan.
PY - 2024/2/15
Y1 - 2024/2/15
N2 - 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.
AB - 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.
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U2 - 10.7566/JPSJ.93.023704
DO - 10.7566/JPSJ.93.023704
M3 - Article
AN - SCOPUS:85185267802
SN - 0031-9015
VL - 93
JO - journal of the physical society of japan
JF - journal of the physical society of japan
IS - 2
M1 - 023704
ER -