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Chin. Phys. B, 2020, Vol. 29(8): 087402    DOI: 10.1088/1674-1056/ab9614

Electrical and thermoelectric study of two-dimensional crystal of NbSe2

Xin-Qi Li(李新祺)1, Zhi-Lin Li(李治林)1, Jia-Ji Zhao(赵嘉佶)1, Xiao-Song Wu(吴孝松)1,2
1 State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Beijing Key Laboratory of Quantum Devices, Peking University, Beijing 100871, China;
2 Frontiers Science Center for Nano-optoelectronics and Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

We report experimental investigation of the resistivity and Nernst effect in two-dimensional (2D) NbSe2 crystals. A strongly enhanced Nernst effect, 100 times larger than that in bulk NbSe2, caused by moving vortices is observed in thin film. It is found that in the low temperature, high magnetic field regime, pinning effects show little dependence on the thickness and resistivity of the superconductor films. Strong Nernst signals persist above the superconducting transition, suggesting that the Nernst effect is a sensitive probe to superconducting fluctuations. A magnetic field induced superconductor-insulator transition (SIT) is evident, which is surprising in that such a SIT usually takes place in disordered dirty superconductors, while our samples are highly crystalline and close to the clean limit. Hence, our results expand the scope of SIT into 2D crystal clean superconductors.

Keywords:  two-dimensional superconductivity      Nernst effect      superconducting fluctuations      superconductor-insulator transition  
Received:  15 March 2020      Revised:  07 May 2020      Accepted manuscript online: 
PACS:  74.78.-w (Superconducting films and low-dimensional structures)  
  74.25.fg (Thermoelectric effects)  
  74.40.Kb (Quantum critical phenomena)  
  74.40.-n (Fluctuation phenomena)  

Project supported by the National Key Basic Research Program of China (Grant No. 2016YFA0300600) and the National Natural Science Foundation of China (Grant Nos. 11574005 and 11774009).

Corresponding Authors:  Xiao-Song Wu     E-mail:

Cite this article: 

Xin-Qi Li(李新祺), Zhi-Lin Li(李治林), Jia-Ji Zhao(赵嘉佶), Xiao-Song Wu(吴孝松) Electrical and thermoelectric study of two-dimensional crystal of NbSe2 2020 Chin. Phys. B 29 087402

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