Metastable superconducting state in quenched KxFe2-ySe2

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	Metastable superconducting state in quenched KxFe2-ySe2
	Han, F ; Yang, H ; Shen, B ; Wang, ZY ; Li, CH ; Wen, HH
刊名	PHILOSOPHICAL MAGAZINE
	2012
卷号	92 期号:19-21 页码:2553
ISSN号	1478-6435
通讯作者	Wen, HH: Nanjing Univ, Natl Lab Solid State Microstruct, Ctr Superconducting Phys & Mat, Nanjing 210093, Jiangsu, Peoples R China.
中文摘要	By direct quenching or post-annealing followed by quenching, we have successfully obtained a series of KxFe2-ySe2 samples with different properties. It is found that the samples directly quenched in the cooling process of growth show superconductivity and the one cooled with a furnace is insulating even though their stoichiometries are similar. The sample cooled with the furnace can be tuned from insulating to superconducting by post-annealing and then quenching. Based on these two points, we conclude that the superconducting state in KxFe2-ySe2 is metastable, and quenching is the key point to achieve the superconducting state. The similar stoichiometries of all the non-superconducting and superconducting samples indicate that the iron valence does not play a decisive role in determining whether a KxFe2-ySe2 sample is superconducting. Combining with the result obtained in the KxFe2-ySe2 thin films prepared by molecular beam epitaxy, we argue that our superconducting sample partly corresponds to the phase without iron vacancies as evidenced by scanning tunneling microscopy and the insulating sample mainly corresponds to the phase with the root 5 x root 5 vacancy order. Quenching may play the role of freezing the phase without iron vacancies.
收录类别	SCI
资助信息	Natural Science Foundation of China; Ministry of Science and Technology of China [2011CBA00102]
语种	英语
公开日期	2013-09-18
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/41952]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Han, F,Yang, H,Shen, B,et al. Metastable superconducting state in quenched KxFe2-ySe2[J]. PHILOSOPHICAL MAGAZINE,2012,92(19-21):2553.
APA	Han, F,Yang, H,Shen, B,Wang, ZY,Li, CH,&Wen, HH.(2012).Metastable superconducting state in quenched KxFe2-ySe2.PHILOSOPHICAL MAGAZINE,92(19-21),2553.
MLA	Han, F,et al."Metastable superconducting state in quenched KxFe2-ySe2".PHILOSOPHICAL MAGAZINE 92.19-21(2012):2553.