Magnetoresistivity plateau of graphene in proximity to superconducting NbSe2
Xiaoqiang Zhang, Ran Tao, Laiming Wei, Jiangang Xu, Haixing Liang, Lijun Zhu, Yi Zhang, Naizhou Wang, Xianhui Chen, Changgan Zeng
DOI 10.1103/PhysRevB.94.125404 · Physical Review B
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Abstract
The distribution and dynamic behavior of Abrikosov vortices in type-II superconductors could modulate the nearby magnetic field, thus enriching new physics in the proximal two-dimensional electron gas. Here we investigate the effects of vortex dynamics on the quantum transport properties of graphene in proximity to the superconducting single-crystalline NbSe2 thin flakes. Pronounced asymmetric magnetoresistivity plateaus emerge near zero field below the critical temperature of NbSe2, accompanied by hysteresis loops. In sharp contrast, only weak localization behavior is observed for graphene placed on SiO2/Si substrate. Such magnetoresistivity plateaus and hysteresis can be attributed to the vortex pinning effect at the edge defects of the single-crystalline NbSe2 flakes. Our findings may shed light on the realization of emergent states in the two-dimensional electron gases by manipulation of vortex dynamics and distribution in the proximal superconductors.
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. | 6.5 | Pressure unresolved | unknown |
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