High-Energy Anomaly in the Band Dispersion of the Ruthenate Superconductor

Physical Review Letters 109 巻 6 号 066404- 頁 2012 発行
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タイトル ( eng )
High-Energy Anomaly in the Band Dispersion of the Ruthenate Superconductor
作成者
Yoshida Yoshiyuki
Hase Izumi
Aiura Yoshihiro
収録物名
Physical Review Letters
109
6
開始ページ 066404
抄録
We reveal a “high-energy anomaly" (HEA) in the band dispersion of the unconventional ruthenate superconductor Sr2RuO4, by means of high-resolution angle-resolved photoemission spectroscopy (ARPES) with tunable energy and polarization of incident photons. This observation provides another class of correlated materials exhibiting this anomaly beyond high-Tc cuprates. We demonstrate that two distinct types of band renormalization associated with and without the HEA occur as a natural consequence of the energetics in the bandwidth and the energy scale of the HEA. Our results are well reproduced by a simple analytical form of the self-energy based on the Fermi-liquid theory, indicating that the HEA exists at a characteristic energy scale of the multielectron excitations. We propose that the HEA universally emerges if the systems have such a characteristic energy scale inside of the bandwidth.
NDC分類
物理学 [ 420 ]
言語
英語
資源タイプ 学術雑誌論文
出版者
American Physical Society
発行日 2012
権利情報
(c) 2012 American Physical Society
出版タイプ Version of Record(出版社版。早期公開を含む)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 0031-9007
[DOI] 10.1103/PhysRevLett.109.066404
[NCID] AA00773679
[DOI] http://dx.doi.org/10.1103/PhysRevLett.109.066404