Graphene on SiC as a Q-switcher for a 2 mu m laser

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	Graphene on SiC as a Q-switcher for a 2 mu m laser
	Wang, Q ; Teng, H ; Zou, YW ; Zhang, ZG ; Li, DH ; Wang, R ; Gao, CQ ; Lin, JJ ; Guo, LW ; Wei, ZY
刊名	OPTICS LETTERS
	2012
卷号	37 期号:3 页码:395
关键词	SATURABLE-ABSORBER FIBER LASER
ISSN号	0146-9592
通讯作者	Wei, ZY: Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Lab Opt Phys, Beijing 100190, Peoples R China.
中文摘要	The newly discovered alkali-doped iron selenide superconductors(1,2) not only reach a superconducting transition temperature as high as 32 K, but also exhibit unique characteristics that are absent from other iron-based superconductors, such as antiferromagnetically ordered insulating phases(3,4), extremely high Neel transition temperatures(5,6) and the presence of Fe vacancies and ordering(7-10). These features have generated considerable excitement as well as confusion, regarding the delicate interplay between Fe vacancies, magnetism and superconductivity(11-13). Here we report on molecular beam epitaxy growth of high-quality KxFe2-ySe2 thin films and in situ low-temperature scanning tunnelling microscope measurement of their atomic and electronic structures. We demonstrate that a KxFe2-ySe2 sample contains two distinct phases: an insulating phase with well-defined root 5 x root 5 order of Fe vacancies, and a superconducting KFe2Se2 phase containing no Fe vacancies. An individual Fe vacancy can locally destroy superconductivity in a similar way to a magnetic impurity in conventional superconductors. Measurement of the magnetic-field dependence of the Fe-vacancy-induced bound states reveals a magnetically related bipartite order in the tetragonal iron lattice. These findings elucidate the existing controversies on this new superconductor and provide atomistic information on the interplay between magnetism and superconductivity in iron-based superconductors.
收录类别	SCI
资助信息	National Basic Research Program of China [2007CB815104, 2011CB932700]; Chinese Academy of Sciences [kjcx2-YW-N36]; National High Technology Research and Development Program of China [2011AA030205]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/38819]
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	Wang, Q,Teng, H,Zou, YW,et al. Graphene on SiC as a Q-switcher for a 2 mu m laser[J]. OPTICS LETTERS,2012,37(3):395.
APA	Wang, Q.,Teng, H.,Zou, YW.,Zhang, ZG.,Li, DH.,...&Wei, ZY.(2012).Graphene on SiC as a Q-switcher for a 2 mu m laser.OPTICS LETTERS,37(3),395.
MLA	Wang, Q,et al."Graphene on SiC as a Q-switcher for a 2 mu m laser".OPTICS LETTERS 37.3(2012):395.