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重い電子系超伝導体UPd$$_2$$Al$$_3$$に対する軟X線放射光角度分解光電子分光

Soft X-ray angle resolved photoelectron spectroscopy study of heavy Fermion superconductor UPd$$_2$$Al$$_3$$

藤森 伸一   ; 斎藤 祐児  ; 岡根 哲夫  ; 藤森 淳; 山上 浩志; 芳賀 芳範   ; 山本 悦嗣  ; 大貫 惇睦

Fujimori, Shinichi; Saito, Yuji; Okane, Tetsuo; Fujimori, Atsushi; Yamagami, Hiroshi; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika

超伝導を示す重い電子系化合物UPd$$_2$$Al$$_3$$の電子状態に対して、軟X線領域の放射光を用いた角度分解光電子分光法を行い、その電子状態に対する研究を行った。この化合物の超伝導と磁性を担っているU 5f電子に由来する重い準粒子バンドが実験的に観測され、U 5f電子は遍歴的な性質が強いこと、また、バンド構造は温度変化を示し、低温での遍歴状態から高温における局在状態へと変化することが明らかとなった。これらの結果は、この化合物の超伝導モデルに対しても重要な情報を与えている。

We have performed angle-resolved photoemission experiments in soft X-ray region (SX-ARPES) for the heavy Fermion superconductor UPd$$_2$$Al$$_3$$ to observe its band structure. At low temperatures (20 K), renormalized quasi-particle bands were observed in the vicinity of the Fermi level. The overall structure of ARPES spectra including strongly dispersive bands on the higher binding energy sides is fairly well explained by the band structure calculation treating U 5f electrons as being itinerant. This suggests that itinerant description is a reasonable approach to understand their electronic properties at low temperatures. On the other hand, at high temperatures (100 K), the quasi-particle bands moved toward higher binding energies, and became less dispersive. This suggests that the U 5f electrons change their character from itinerant one at low temperatures to localized one at high temperatures.

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