Fermi Surface and Band Structure of (Ca,La)FeAs<sub>2</sub> Superconductor from Angle-Resolved Photoemission Spectroscopy

doi:10.1088/0256-307X/30/12/127402

Chin. Phys. Lett.

2013, Vol. 30

Issue (12): 127402 DOI: 10.1088/0256-307X/30/12/127402

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

Fermi Surface and Band Structure of (Ca,La)FeAs₂ Superconductor from Angle-Resolved Photoemission Spectroscopy

LIU Xu¹, LIU De-Fa¹, ZHAO Lin^{1 **}, GUO Qi¹, MU Qing-Ge¹, CHEN Dong-Yun¹, SHEN Bing¹, YI He-Mian¹, HUANG Jian-Wei¹, HE Jun-Feng¹, PENG Ying-Ying¹, LIU Yan¹, HE Shao-Long¹, LIU Guo-Dong¹, DONG Xiao-Li¹, ZHANG Jun¹, CHEN Chuang-Tian², XU Zu-Yan², REN Zhi-An^1**, ZHOU Xing-Jiang^1**

¹National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
²Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190

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LIU Xu, LIU De-Fa, ZHAO Lin et al 2013 Chin. Phys. Lett. 30 127402

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Abstract

The (Ca,R)FeAs₂ (R=La, Pr, etc.) superconductors with a signature of superconductivity transition above 40 K possess a new kind of block layers that consist of zig-zag As chains. We report the electronic structure of the new (Ca,La)FeAs₂ superconductor investigated by both band structure calculations and high resolution angle-resolved photoemission spectroscopy measurements. Band structure calculations indicate that there are four hole-like bands around the zone center Γ(0,0) and two electron-like bands near the zone corner M(π, π) in CaFeAs₂. In our angle-resolved photoemission measurements on (Ca_0.9La_0.1)FeAs₂, we have observed three hole-like bands around the Γ point and one electron-like Fermi surface near the M(π, π) point. These results provide important information to compare and contrast with the electronic structure of other iron-based compounds in understanding the superconductivity mechanism in the iron-based superconductors.

Received: 24 November 2013 Published: 13 December 2013

PACS:	74.70.-b	(Superconducting materials other than cuprates)
	74.25.Jb	(Electronic structure (photoemission, etc.))
	79.60.-i	(Photoemission and photoelectron spectra)
	71.20.-b	(Electron density of states and band structure of crystalline solids)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/30/12/127402 OR https://cpl.iphy.ac.cn/Y2013/V30/I12/127402

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Articles by authors
	LIU Xu
	LIU De-Fa
	ZHAO Lin
	GUO Qi
	MU Qing-Ge
	CHEN Dong-Yun
	SHEN Bing
	YI He-Mian
	HUANG Jian-Wei
	HE Jun-Feng
	PENG Ying-Ying
	LIU Yan
	HE Shao-Long
	LIU Guo-Dong
	DONG Xiao-Li
	ZHANG Jun
	CHEN Chuang-Tian
	XU Zu-Yan
	REN Zhi-An
	ZHOU Xing-Jiang

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