"Selenium capped monolayer NbSe2 for two-dimensional superconductivity studies"

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, Alex Zettl; physica status solidi (b), 08/01/16.

Additional Authors: Miguel M. Ugeda, Yi Zhang, Yi Chen, Claudia Ojeda-Aristizabal, Hyejin Ryu, Sung-Kwan Mo, Zahid Hussain, Zhi-Xun Shen, Michael F. Crommie, Alex Zettl

Abstract:

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 TC = 1.9 K.  Insitu 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.

pssb201600235-gra-0001

Schematic of monolayer NbSe2/bilayer graphene with selenium capping layer and electrical contacts.

.