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Unique Domain Structure of Two-Dimensional alpha-Mo2C Superconducting Crystals
Liu, Zhibo; Xu, Chuan; Kang, Ning; Wang, Libin; Jiang, Yixiao; Du, Jiao; Liu, Ying; Ma, Xiu-Liang; Cheng, Hui-Ming; Ren, Wencai; Ma, XL; Ren, WC (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
2016-07-01
发表期刊NANO LETTERS
ISSN1530-6984
卷号16期号:7页码:4243-4250
摘要The properties of two-dimensional (2D) materials such as graphene and monolayer transition metal dichalcogenides are strongly influenced by domain boundaries. Ultrathin transition metal carbides are a class of newly emerging 2D materials that are superconducting and have many potential applications such as in electrochemical energy storage, catalysis, and thermoelectric energy conversion. However, little is known about their domain structure and the influence of domain boundaries on their properties. Here we use atomic-resolution scanning transmission electron microscopy combined with large-scale diffraction-filtered imaging to study the microstructure of chemical vapor deposited high-quality 2D alpha-Mo2C superconducting crystals of different regular shapes including triangles, rectangles, hexagons, octagons, nonagons, and dodecagons. The Mo atom sublattice in all these crystals has a uniform hexagonal closely packed arrangement without any boundaries. However, except for rectangular and octagonal crystals, the C atom sublattices are composed of three or six domains with rotational-symmetry and well-defined line-shaped domain boundaries because of the presence of three equivalent off-center directions of interstitial carbon atoms in Mo octahedra. We found that there is very small lattice shear strain across the domain boundary. In contrast to the single sharp transition observed in single-domain crystals, transport studies across domain boundaries show a broad resistive superconducting transition with two distinct transition processes due to the formation of localized phase slip events within the boundaries, indicating a significant influence of the boundary on 2D superconductivity. These findings provide new understandings on not only the microstructure of 2D transition metal carbides but also the intrinsic influence of domain boundaries on 2D superconductivity.
部门归属[liu, zhibo ; xu, chuan ; jiang, yixiao ; liu, ying ; ma, xiu-liang ; cheng, hui-ming ; ren, wencai] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china ; [kang, ning ; wang, libin ; du, jiao] peking univ, key lab phys & chem nanodevices, beijing 100871, peoples r china ; [kang, ning ; wang, libin ; du, jiao] peking univ, dept elect, beijing 100871, peoples r china
关键词2d Crystals Alpha-mo2c Domain Boundary Superconductivity
学科领域Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
资助者National Science Foundation of China [51325205, 51290273, 51521091, 51172240, 11374019]; Chinese Academy of Sciences [KGZD-EW-303-1, KGZD-EW-T06]
收录类别sci
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/75803
专题中国科学院金属研究所
通讯作者Ma, XL; Ren, WC (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
推荐引用方式
GB/T 7714
Liu, Zhibo,Xu, Chuan,Kang, Ning,et al. Unique Domain Structure of Two-Dimensional alpha-Mo2C Superconducting Crystals[J]. NANO LETTERS,2016,16(7):4243-4250.
APA Liu, Zhibo.,Xu, Chuan.,Kang, Ning.,Wang, Libin.,Jiang, Yixiao.,...&Ren, WC .(2016).Unique Domain Structure of Two-Dimensional alpha-Mo2C Superconducting Crystals.NANO LETTERS,16(7),4243-4250.
MLA Liu, Zhibo,et al."Unique Domain Structure of Two-Dimensional alpha-Mo2C Superconducting Crystals".NANO LETTERS 16.7(2016):4243-4250.
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