Bulk 4f Electronic States of Ce-Based Heavy Fermion System Probed by High-Resolution Resonance Photoemission

Akira Sekiyama; Koji Kadono; Kyoko Matsuda; Takeshi Iwasaki; Shigenori Ueda; Shin Imada; Shigemasa Suga; Rikio Settai; Hisashi Azuma; Yoshichika Onuki; Yuji Saitoh

doi:10.1143/jpsj.69.2771

Bulk 4f Electronic States of Ce-Based Heavy Fermion System Probed
by High-Resolution Resonance Photoemission

Akira Sekiyama, Koji Kadono, Kyoko Matsuda, Takeshi Iwasaki, Shigenori Ueda, Shin Imada, Shigemasa Suga, Rikio Settai, Hisashi Azuma, Yoshichika Onuki, Yuji Saitoh

Author information

Akira Sekiyama
Department of Material Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560–8531
Koji Kadono
Department of Material Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560–8531
Kyoko Matsuda
Department of Material Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560–8531
Takeshi Iwasaki
Department of Material Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560–8531
Shigenori Ueda
Department of Material Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560–8531
Shin Imada
Department of Material Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560–8531
Shigemasa Suga
Department of Material Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560–8531
Rikio Settai
Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560–0043
Hisashi Azuma
Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560–0043
Yoshichika Onuki
Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560–0043
Yuji Saitoh
Department of Synchrotron Radiation Research, Kansai Research Establishment, Japan Atomic Energy Research Institute, SPring–8, Mikazuki, Hyogo 679–5198

Keywords: resonance photoemission, bulk Ce 4f states, heavy fermion, single impurity Anderson model, Kondo temperature, crystalline electric field

JOURNAL RESTRICTED ACCESS

2000 Volume 69 Issue 9 Pages 2771-2774

DOI https://doi.org/10.1143/jpsj.69.2771

Details

Abstract

``Bulk-sensitive'' Ce 3d-4f resonance photoemission (RPES) with an unprecedentedly high resolution has revealed a clear difference of bulk Ce 4f spectral weights of heavy fermion system CeRu₂Si₂ and CeRu₂Ge₂ in the region of the tail of the Kondo peak and its spin-orbit partner. The significant spectral difference in both materials is in strong contrast to the mutually similar ``surface-sensitive'' 4d-4f RPES. The obtained bulk-sensitive spectra are well reproduced by a single impurity model. Consideration of the crystalline electric field splitting is important for estimating a realistic Kondo temperature from the bulk 4f spectra.

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