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川崎 郁斗; 竹内 一陽*; 藤森 伸一; 竹田 幸治; 山上 浩志; 山本 悦嗣; 芳賀 芳範
Physical Review B, 108(16), p.165127_1 - 165127_9, 2023/10
被引用回数：1 パーセンタイル：0.00(Materials Science, Multidisciplinary)We performed angle-resolved photoemission spectroscopy (ARPES) experiments using soft X rays to investigate the electronic structure of the heavy-fermion superconductor UPt. The overall band structure revealed by the present ARPES measurements is compared with density-functional calculations for UPt and the non-
reference compound ThPt. We showed that the calculation for ThPt gives a better description of the experimental band structure, except for the -derived heavy quasiparticle bands. This situation is reminiscent of Ce-based heavy-fermion systems, whose band structures are often very similar to those of non-
La-based compounds. The narrow heavy quasiparticle bands are located just below the Fermi level (
), and their band structure could not be resolved by the present energy resolution. We also showed that most of the U spectral weight exists not as the coherent heavy-fermion bands but as incoherent components that distribute over a wide energy range, spanning from near to approximately 2 eV. This result indicates that the heavy quasiparticle bands are enormously renormalized by the electron correlation effect. Additionally, we showed that the spectral intensity of the heavy-fermion bands is almost temperature independent, at least up to 100 K, where the magnetic susceptibility follows a Curie-Weiss behavior.
濱 克宏; 高橋 一晴; 石井 英一; 竹内 竜史; 佐々木 学; 國丸 貴紀; 松井 裕哉
JNC TN5400 2003-002, 61 Pages, 2003/08
JNC-TN5400-2003-002.pdf:5.42MBJNC-TN5400-2003-002(errata).pdf:0.08MB
幌延深地層研究計画における試錐調査計画(HDB-6,7,8孔)を策定した。
の電子状態の研究川崎 郁斗; 藤森 伸一; 竹田 幸治; 角田 一樹; 山上 浩志; 山本 悦嗣; 芳賀 芳範; 竹内 一陽
no journal, ,
重い電子系超伝導体UPtに対して軟X線角度分解光電子分光測定を行い、バンド分散及びフェルミ面の導出を試みた。フェルミ準位近傍にはU5f軌道に由来するフラットなバンドが観測された。当日は実験から得られたバンド構造をバンド計算と比較して、U5f電子の状態の議論を行う。
