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题名: Orbital characters and electronic correlations in KCo2Se2
作者: Liu, ZH;  Zhao, YG;  Li, Y;  Jia, LL;  Cai, YP;  Zhou, S;  Xia, TL;  Buchner, B;  Borisenko, SV;  Wang, SC
刊名: JOURNAL OF PHYSICS-CONDENSED MATTER
出版日期: 2015
卷号: 27, 期号:29, 页码:295501
关键词: orbital characters ;  electronic correlations ;  KCo2Se2
学科分类: Physics
DOI: http://dx.doi.org/10.1088/0953-8984/27/29/295501
通讯作者: Liu, ZH (reprint author), Renmin Univ, Dept Phys, Beijing 100872, Peoples R China.
文章类型: Article
英文摘要: We report a comprehensive study of the tridimensional nature and orbital characters of the low-energy electronic structure in KCo2Se2, using polarization-and photon energy-dependent angle-resolved photoemission spectroscopy. We observed one electron-like Fermi surface (FS) at the Brillouin zone (BZ) center, four electron-like FSs centered at the BZ corner, and one hole-like FS at the BZ boundary. The FSs show weak dispersion along the k(z) direction, indicating the near-two-dimensional nature of FSs in KCo2Se2. In combination with the local-density approximation calculations, we determined the orbital characters of the lowenergy electronic bands, which are mainly derived from the Co 3d orbital, mixed with part of the Se 4p states. The d(x2-y2) orbital gives a significant contribution to the band crossing the Fermi level. A band renormalization of about 1.6 is needed to capture the essential dispersive features, which suggests that electronic correlations are much weaker than that in KyFe2-xSe2.
类目[WOS]: Physics, Condensed Matter
关键词[WOS]: SUPERCONDUCTIVITY ;  PHOTOEMISSION
收录类别: SCI
项目资助者: Chinese Academy of Sciences ;  Ministry of Science and Technology of China ;  National Science Foundation of China [11274381, 11004245] ;  National Science Foundation [DMR-0537588] ;  [BO1912/2-2] ;  [BO1912/3-1] ;  [BE1749/13]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/20913
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Recommended Citation:
Liu, ZH,Zhao, YG,Li, Y,et al. Orbital characters and electronic correlations in KCo2Se2[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,2015,27(29):295501.
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