Magnetic field enhanced zero-bias conductance in vertical Josephson junctions based on Weyl semimetals
Zhu Lin, Hua-Ding Song, Xing-Guo Ye, Jianhong Xue, An-Qi Wang, Yan Zhang, Song Liu, Zhensheng Zhang, Hongqi Xu, Dapeng Yu, Zhi-Min Liao
DOI 10.1103/PhysRevB.101.214519 · Physical Review B
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Abstract
We report the magnetotransport properties of Td−MoTe2 based vertical junctions with NbN superconducting electrodes. Benefiting from the high critical magnetic field of NbN, the superconducting state is maintained up to 8 T. A sharp drop of resistance is observed at Tc∼13K, corresponding to the critical temperature of NbN electrodes. The differential conductance spectra show that the zero-bias conductance is increased by magnetic fields with 41.6% increment at 14 T. Intriguingly, negative magnetoresistance (MR) ∼−48% is observed under 8 T at 3 K. The negative MR disappears above superconductivity critical temperature ∼13 K. The Weyl semimetal MoTe2 combined with superconductor is promising for searching topological superconductivity and Majorana zero modes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | onset |
| MoTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.1 | Pressure not reported | onset |
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