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タイトル: | High-energy spin and charge excitations in electron-doped copper oxide superconductors. |
著者: | Ishii, K Fujita, M Sasaki, T Minola, M Dellea, G Mazzoli, C Kummer, K Ghiringhelli, G Braicovich, L Tohyama, T Tsutsumi, K Sato, K Kajimoto, R Ikeuchi, K Yamada, K Yoshida, M Kurooka, M Mizuki, J |
著者名の別形: | 遠山, 貴巳 |
キーワード: | Physical sciences Condensed matter |
発行日: | 25-Apr-2014 |
出版者: | Nature Publishing Group |
誌名: | Nature communications |
巻: | 5 |
論文番号: | 3714 |
抄録: | The evolution of electronic (spin and charge) excitations upon carrier doping is an extremely important issue in superconducting layered cuprates and the knowledge of its asymmetry between electron- and hole-dopings is still fragmentary. Here we combine X-ray and neutron inelastic scattering measurements to track the doping dependence of both spin and charge excitations in electron-doped materials. Copper L3 resonant inelastic X-ray scattering spectra show that magnetic excitations shift to higher energy upon doping. Their dispersion becomes steeper near the magnetic zone centre and they deeply mix with charge excitations, indicating that electrons acquire a highly itinerant character in the doped metallic state. Moreover, above the magnetic excitations, an additional dispersing feature is observed near the Γ-point, and we ascribe it to particle-hole charge excitations. These properties are in stark contrast with the more localized spin excitations (paramagnons) recently observed in hole-doped compounds even at high doping levels. |
記述: | 量子ビームの合わせ技で電子の動きを捉える -三種の非弾性散乱を用いて銅酸化物高温超伝導体における電子励起状態の全体像を解明-. 京都大学プレスリリース. 2014-04-30. |
著作権等: | © 2014 Macmillan Publishers Limited. 許諾条件により本文は2014-10-26に公開. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/186984 |
DOI(出版社版): | 10.1038/ncomms4714 |
PubMed ID: | 24762677 |
関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2014-04-30 |
出現コレクション: | 学術雑誌掲載論文等 |
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