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4$$f$$-derived Fermi surfaces of CeRu$$_2$$(Si$$_{1-x}$$Ge$$_{x}$$)$$_2$$ near the quantum critical point; Resonant soft-X-ray ARPES study

Okane, Tetsuo  ; Okochi, Takuo*; Takeda, Yukiharu   ; Fujimori, Shinichi   ; Yasui, Akira; Saito, Yuji  ; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; Sugi, Motoki*; Kimura, Noriaki*; Komatsubara, Takemi*; Aoki, Haruyoshi*

Angle-resolved photoelectron spectroscopy in the Ce $$3d$$$$rightarrow$$4$$f$$ excitation region was measured for the paramagnetic state of CeRu$$_2$$Si$$_2$$, CeRu$$_2$$(Si$$_{0.82}$$Ge$$_{0.18}$$)$$_2$$, and LaRu$$_2$$Si$$_2$$ to investigate the changes of the 4$$f$$ electron Fermi surfaces around the quantum critical point. While the difference of the Fermi surfaces between CeRu$$_2$$Si$$_2$$ and LaRu$$_2$$Si$$_2$$ was experimentally confirmed, a strong 4$$f$$-electron character was observed in the band structures and the Fermi surfaces of CeRu$$_2$$Si$$_2$$ and CeRu$$_2$$(Si$$_{0.82}$$Ge$$_{0.18}$$)$$_2$$, consequently indicating a delocalized nature of the 4$$f$$ electrons in both compounds. The absence of Fermi surface reconstruction across the critical composition suggests that SDW quantum criticality is more appropriate than local quantum criticality in CeRu$$_2$$(Si$$_{1-x}$$Ge$$_{x}$$)$$_2$$.

Language

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English

Journal

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Physical Review Letters

Volume

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102

Number

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21

Pages

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p.216401_1 - 216401_4

Publication Year/Month

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2009/05

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Held date

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Location (city)

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Location (country)

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Patent information

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PDF

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Paper URL

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https://doi.org/10.1103/PhysRevLett.102.216401

DOI for research data

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Keywords

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no keyword

Research Facility

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SPring-8(大型放射光施設)

Press Release

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First Direct Observation of Fermi Surfaces Formed by 'Heavy Electrons'; Clue to the Mechanism of Superconductivity Coexisting with Magnetism
「重い電子」が作るフェルミ面の直接観測に世界で初めて成功; 磁性と共存する不思議な超伝導の機構解明への糸口

Article of JAEA R&D Review

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Direct Observation of Fermi Surfaces Formed by Heavy Electrons; Clue to the Mechanism of Anomalous Superconductivity Coexisting with Magnetism[/]

Cooperating Institute

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東北大学

Accesses

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- Accesses

InCites™

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Percentile:77.12

Category:Physics, Multidisciplinary

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