Orbital characters and electronic correlations in KCo2Se2

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	Orbital characters and electronic correlations in KCo2Se2
	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
	2015
卷号	27 期号:29 页码:295501
关键词	orbital characters electronic correlations KCo2Se2
通讯作者	Liu, ZH (reprint author), Renmin Univ, Dept Phys, Beijing 100872, Peoples R China.
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.
学科主题	Physics
类目[WOS]	Physics, Condensed Matter
关键词[WOS]	SUPERCONDUCTIVITY ; PHOTOEMISSION
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/20913]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	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.
APA	Liu, ZH.,Zhao, YG.,Li, Y.,Jia, LL.,Cai, YP.,...&Wang, SC.(2015).Orbital characters and electronic correlations in KCo2Se2.JOURNAL OF PHYSICS-CONDENSED MATTER,27(29),295501.
MLA	Liu, ZH,et al."Orbital characters and electronic correlations in KCo2Se2".JOURNAL OF PHYSICS-CONDENSED MATTER 27.29(2015):295501.