Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films

doi:10.1088/0256-307X/31/1/017401

Chin. Phys. Lett.

2014, Vol. 31

Issue (1): 017401 DOI: 10.1088/0256-307X/31/1/017401

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

Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films

ZHANG Wen-Hao^1,4, SUN Yi², ZHANG Jin-Song¹, LI Fang-Sen^1,4, GUO Ming-Hua¹, ZHAO Yan-Fei², ZHANG Hui-Min⁴, PENG Jun-Ping⁴, XING Ying², WANG Hui-Chao², FUJITA Takeshi⁵, HIRATA Akihiko⁵, LI Zhi⁴, DING Hao¹, TANG Chen-Jia^1,4, WANG Meng⁴, WANG Qing-Yan¹, HE Ke^1,3,4, JI Shuai-Hua^{1, 3}, CHEN Xi^1,3, WANG Jun-Feng⁶, XIA Zheng-Cai⁶, LI Liang⁶, WANG Ya-Yu^1,3, WANG Jian^2,3∗∗, WANG Li-Li^1,3,4∗∗, CHEN Ming-Wei⁵, XUE Qi-Kun^1,3∗∗, MA Xu-Cun^1,3,4

¹State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084
²International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871
³Collaborative Innovation Center of Quantum Matter, Beijing
⁴Institute of Physics, Chinese Academy of Sciences, Beijing 100190
⁵WPI Advanced Institute for Materials Research, Tohoku University, Sendai 9808577, Japan
⁶Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430071

Cite this article:

ZHANG Wen-Hao, SUN Yi, ZHANG Jin-Song et al 2014 Chin. Phys. Lett. 31 017401

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Abstract

We prepared one-unit-cell (1-UC) thick FeSe films on insulating SrTiO₃ substrates with non-superconducting FeTe protection layers by molecular beam epitaxy for ex situ studies. By direct transport and magnetic measurements, we provide definitive evidence for high temperature superconductivity in the 1-UC FeSe films with an onset T_C above 40 K and an extremely large critical current density J_C∼1.7×10⁶ A/cm² at 2 K, which are much higher than T_C∼8 K and J_C∼10⁴ A/cm² for bulk FeSe, respectively. Our work may pave the way to enhancing and tailoring superconductivity by interface engineering.

Received: 13 December 2013 Published: 28 January 2014

PACS:	74.25.F-	(Transport properties)
	74.70.Xa	(Pnictides and chalcogenides)
	74.78.-w	(Superconducting films and low-dimensional structures)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/31/1/017401 OR https://cpl.iphy.ac.cn/Y2014/V31/I1/017401

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	ZHANG Wen-Hao
	SUN Yi
	ZHANG Jin-Song
	LI Fang-Sen
	GUO Ming-Hua
	ZHAO Yan-Fei
	ZHANG Hui-Min
	PENG Jun-Ping
	XING Ying
	WANG Hui-Chao
	FUJITA Takeshi
	HIRATA Akihiko
	LI Zhi
	DING Hao
	TANG Chen-Jia
	WANG Meng
	WANG Qing-Yan
	HE Ke
	JI Shuai-Hua
	CHEN Xi
	WANG Jun-Feng
	XIA Zheng-Cai
	LI Liang
	WANG Ya-Yu
	WANG Jian
	WANG Li-Li
	CHEN Ming-Wei
	XUE Qi-Kun
	MA Xu-Cun

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