Metastable Face-Centered Cubic Structure and Structural Transition of Sn on 2H-NbSe2 (0001)
Metastable Face-Centered Cubic Structure and Structural Transition of Sn on 2H-NbSe2 (0001)
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2H-NbSe2 (0001) 上 Sn 的亚稳态面心立方结构和结构转变
DOI：
10.1088/0256-307x/35/6/066802
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发表时间：
2018
影响因子：
3.5
通讯作者：
Jia Jin Feng
中科院分区：
文献类型：
--
作者：
Li Ai Min;Lu Dong;Yang Xin Yi;Zhu Zhen;Wang Guan Yong;Guan Dan Dan;Zheng Hao;Li Yao Yi;Liu Canhua;Qian Dong;Jia Jin Feng
用低温扫描隧道显微镜或能谱研究了生长在超导衬底2 H-NbSe_2（0001）上的Sn岛的表面结构和性质。得到了纯的面心立方（fcc）结构的Sn表面。在fcc-Sn（111）面上也检测到了超导性，并且Sn面上的超导能隙的大小与超导衬底上的几乎相同。在室温下放置一定时间后，样品发生了从fcc-Sn（111）到β-Sn（001）的相变。由于β-Sn岛上的应变弛豫，面内和面外结构都发生畸变，表面原子高度周期性变化，形成普遍的涟漪结构。
Surface structures and properties of Sn islands grown on superconducting substrate 2H-NbSe2(0001) are studied using low temperature scanning tunneling microscopy or spectroscopy. The pure face-centered cubic (fcc) structure of Sn surface is obtained. Superconductivity is also detected on the fcc-Sn(111) surface, and the size of superconducting gap on the Sn surface is nearly the same as that on the superconducting substrate. Furthermore, phase transition occurs from fcc-Sn(111) to β-Sn(001) by keeping the sample at room temperature for a certain time. Due to the strain relaxation on the β-Sn islands, both the in-plane unit cell and out-of-plane structures distort, and the height of surface atoms varies periodically to form a universal ripple structure.