Electric field effect on superconductivity in atomically thin flakes of NbSe2
Neal E. Staley, Jian Wu, Peter Eklund, Ying Liu, Linjun Li, Zhuan Xu
DOI 10.1103/PhysRevB.80.184505 · Physical Review B
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Abstract
We studied the electric field effect on superconductivity in atomically thin flakes of NbSe2 prepared by mechanical exfoliation. We found that these NbSe2 flakes are superconducting down to a thickness of a single unit cell consisting of two molecular layers of NbSe2 with an onset superconducting transition temperature (Tc) up to 2.5 K. We demonstrated that the Tc of the thinnest flakes can be modulated by an applied gate voltage with a Tc shift as large as 200 mK, which is larger than expected from a simple consideration based on Bardeen-Cooper-Schrieffer theory. We discuss the possible reasons for the observed enhanced electric field modulation of Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | onset |
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | onset |
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