Selenium capped monolayer NbSe₂ for two-dimensional superconductivity studies

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• 作者：Seita Onishi ; Miguel M. Ugeda ; Yi Zhang ; Yi Chen ; Claudia Ojeda-Aristizabal ; Hyejin Ryu ; Sung-Kwan Mo ; Zahid Hussain ; Zhi-Xun Shen ; Michael F. Crommie and Alex Zettl
• 刊名：physica status solidi (b)
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：253
• 期：12
• 页码：2396-2399
• 全文大小：491K
• ISSN：1521-3951

文摘

Superconductivity in monolayer niobium diselenide (NbSe₂) on bilayer graphene is studied by electrical transport. Monolayer NbSe₂ is grown on bilayer graphene by molecular beam epitaxy and capped with a selenium film to avoid degradation in air. The selenium capped samples have T_C = 1.9 K. In situ measurements down to 4 K in ultrahigh vacuum show that the effect of the selenium layer on the transport is negligible. The superconducting transition and upper critical fields in air exposed and selenium capped samples are compared.