Electronic structure and nematic phase transition in superconducting multiple-layer FeSe films grown by pulsed laser deposition method

doi:10.1088/1674-1056/26/7/077402

Abstract

We report comprehensive angle-resolved photoemission investigations on the electronic structure of single crystal multiple-layer FeSe films grown on CaF₂ substrate by pulsed laser deposition (PLD) method. Measurements on FeSe/CaF₂ samples with different superconducting transition temperatures T_c of 4 K, 9 K, and 14 K reveal electronic difference in their Fermi surface and band structure. Indication of the nematic phase transition is observed from temperature-dependent measurements of these samples; the nematic transition temperature is 140–160 K, much higher than~90 K for the bulk FeSe. Potassium deposition is applied onto the surface of these samples; the nematic phase is suppressed by potassium deposition which introduces electrons to these FeSe films and causes a pronounced electronic structure change. We compared and discussed the electronic structure and superconductivity of the FeSe/CaF₂ films by PLD method with the FeSe/SrTiO₃ films by molecular beam epitaxy (MBE) method and bulk FeSe. The PLD-grown multilayer FeSe/CaF₂ is more hole-doped than that in MBE-grown multiple-layer FeSe films. Our results on FeSe/CaF₂ films by PLD method establish a link between bulk FeSe single crystal and FeSe/SrTiO₃ films by MBE method, and provide important information to understand superconductivity in FeSe-related systems.

Keywords: iron-based superconductor FeSe film ARPES electronic structure

Received: 23 May 2017
Revised: 25 May 2017
Accepted manuscript online:

PACS:	74.70.-b	(Superconducting materials other than cuprates)
	74.78.-w	(Superconducting films and low-dimensional structures)
	79.60.-i	(Photoemission and photoelectron spectra)
	74.25.Jb	(Electronic structure (photoemission, etc.))

Fund:

Project supported by the National Natural Science Foundation of China (Grant No.11574360),the National Basic Research Program of China (Grant Nos.2015CB921300,2013CB921700,and 2013CB921904),the National Key Research and Development Program of China (Grant No.2016YFA0300300),and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No.XDB07020300).

Corresponding Authors: Lin Zhao, Kui Jin, X J Zhou
E-mail: LZhao@iphy.ac.cn;kuijin@iphy.ac.cn;XJZhou@aphy.iphy.ac.cn

Cite this article:

Bing Shen(沈兵), Zhong-Pei Feng(冯中沛), Jian-Wei Huang(黄建伟), Yong Hu(胡勇), Qiang Gao(高强), Cong Li(李聪), Yu Xu(徐煜), Guo-Dong Liu(刘国东), Li Yu(俞理), Lin Zhao(赵林), Kui Jin(金魁), X J Zhou(周兴江) Electronic structure and nematic phase transition in superconducting multiple-layer FeSe films grown by pulsed laser deposition method 2017 Chin. Phys. B 26 077402

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Electronic structure and nematic phase transition in superconducting multiple-layer FeSe films grown by pulsed laser deposition method

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