| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Metastable Face-Centered Cubic Structure and Structural Transition of Sn on 2H-NbSe$_{2}$ (0001) |
| Ai-Min Li1, Lu-Dong1, Xin-Yi Yang1, Zhen Zhu1, Guan-Yong Wang1, Dan-Dan Guan1,2**, Hao Zheng1,2, Yao-Yi Li1,2, Canhua Liu1,2, Dong Qian1,2, Jin-Feng Jia1.2** |
1Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240
2Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093
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| Cite this article: |
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Ai-Min Li, Lu-Dong, Xin-Yi Yang et al 2018 Chin. Phys. Lett. 35 066802 |
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Abstract Surface structures and properties of Sn islands grown on superconducting substrate 2H-NbSe$_{2}$(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 $\beta$-Sn(001) by keeping the sample at room temperature for a certain time. Due to the strain relaxation on the $\beta$-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.
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Received: 01 March 2018
Published: 19 May 2018
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| PACS: |
68.35.B-
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(Structure of clean surfaces (and surface reconstruction))
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68.37.-d
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(Microscopy of surfaces, interfaces, and thin films)
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68.37.Ef
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(Scanning tunneling microscopy (including chemistry induced with STM))
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74.45.+c
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(Proximity effects; Andreev reflection; SN and SNS junctions)
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| Fund: Supported by the National Key Research and Development Program of China under Grant Nos 2016YFA0301003 and 2016YFA0300403, and the National Natural Science Foundation of China under Grant Nos 11521404, 11634009, U1632102, 11504230, 11674222, 11574202, 11674226, 11574201 and U1632272. |
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