Band structures of CeRu2(Si1−xGex)2 studied by resonant soft X-ray ARPES

Angle‐resolved photoelectron spectroscopy (ARPES) measurements were made in the Ce $3d \to 4f$ resonance energy region for the paramagnetic state of CeRu2Si2, CeRu2(Si0.82Ge0.18)2, and LaRu2Si2 to investigate a variation of band structures around the quantum critical point (QCP). The observed band s...

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Bibliographic Details
Published in:Physica status solidi. B. Basic research 2010-03, Vol.247 (3), p.697-699
Main Authors: Okane, Tetsuo, Ohkochi, Takuo, Takeda, Yukiharu, Fujimori, Shin-ichi, Yasui, Akira, Saitoh, Yuji, Yamagami, Hiroshi, Fujimori, Atsushi, Matsumoto, Yuji, Sugi, Motoki, Kimura, Noriaki, Komatsubara, Takemi, Aoki, Haruyoshi
Format: Article
Language:English
Subjects:
71.18.+y
71.27.+a
75.30.Kz
79.60.−i
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Physics
Strongly correlated systems
heavy fermions
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Summary:Angle‐resolved photoelectron spectroscopy (ARPES) measurements were made in the Ce $3d \to 4f$ resonance energy region for the paramagnetic state of CeRu2Si2, CeRu2(Si0.82Ge0.18)2, and LaRu2Si2 to investigate a variation of band structures around the quantum critical point (QCP). The observed band structures are very similar between CeRu2Si2 and CeRu2(Si0.82Ge0.18)2. The results indicate that the Ce 4f electrons in the paramagnetic state have an itinerant character and participate in the formation of energy bands both in CeRu2Si2 and CeRu2(Si0.82Ge0.18)2, and the change of the band structures in the paramagnetic states should be continuous around the QCP of the CeRu2(Si1−xGex)2 system.
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.200983019