Observation of Strong-Coupling Pairing with Weakened Fermi-Surface Nesting at Optimal Hole Doping in Ca0.33Na0.67Fe2As2

doi:10.1088/0256-307X/31/6/067403

Chin. Phys. Lett.

2014, Vol. 31

Issue (06): 067403 DOI: 10.1088/0256-307X/31/6/067403

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

Observation of Strong-Coupling Pairing with Weakened Fermi-Surface Nesting at Optimal Hole Doping in Ca_0.33Na_0.67Fe₂As₂

SHI Ying-Bo¹, HUANG Yao-Bo^1,2, WANG Xiao-Ping^1,2, SHI Xun^1,2, ROEKEGHEM A-Van^1,3, ZHANG Wei-Lu¹, XU Na^1,2, RICHARD Pierre^1,4**, QIAN Tian^1**, RIENKS Emile⁵, THIRUPATHAIAH S^5,6, ZHAO Kan¹, JIN Chang-Qing^1,4, SHI Ming², DING Hong^1,4

¹Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190
²Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland
³Centre de Physique Théorique, Ecole Polytechnique, CNRS-UMR7644,Palaiseau 91128, France
⁴Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871
⁵Helmholtz-Zentrum Berlin, BESSY,Berlin D-12489, Germany
⁶IFW-Dresden, P. O. Box 270116,Dresden D-01171, Germany

Cite this article:

SHI Ying-Bo, HUANG Yao-Bo, WANG Xiao-Ping et al 2014 Chin. Phys. Lett. 31 067403

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Abstract We report an angle-resolved photoemission investigation of optimally doped Ca_0.33Na_0.67Fe₂As₂. The Fermi surface topology of this compound is similar to that of the well-studied Ba_0.6K_0.4Fe₂As₂ material, except for larger hole pockets resulting from a higher hole concentration per Fe atoms. We find that the quasi-nesting conditions are weakened in this compound compared to Ba_0.6K_0.4Fe₂As₂. Similar to Ba_0.6K_0.4Fe₂As₂, we observe nearly isotropic superconducting gaps with Fermi surface-dependent magnitudes for Ca_0.33Na_0.67Fe₂As₂. A small variation in the gap size along the momentum direction perpendicular to the surface is found for one of the Fermi surfaces. Our superconducting gap results on all Fermi surface sheets fit simultaneously very well to a global gap function derived from a strong coupling approach, which contains only 2 global parameters.

Published: 26 May 2014

PACS:	74.70.Xa	(Pnictides and chalcogenides)
	74.25.Jb	(Electronic structure (photoemission, etc.))
	71.18.+y	(Fermi surface: calculations and measurements; effective mass, g factor)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/31/6/067403 OR https://cpl.iphy.ac.cn/Y2014/V31/I06/067403

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	SHI Ying-Bo
	HUANG Yao-Bo
	WANG Xiao-Ping
	SHI Xun
	ROEKEGHEM A-Van
	ZHANG Wei-Lu
	XU Na
	RICHARD Pierre
	QIAN Tian
	RIENKS Emile
	THIRUPATHAIAH S
	ZHAO Kan
	JIN Chang-Qing
	SHI Ming
	DING Hong

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