Continuous tuning of spin-orbit coupled superconductivity in NbSe2
Jia-Yi Ji, Yi Hu, Ting Bao, Yong Xu, Miaoling Huang, Jianhao Chen, Qi-Kun Xue, Ding Zhang
DOI 10.1103/PhysRevB.110.104509 · Physical Review B
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Abstract
NbSe2 is expected to host a rich variety of quantum phenomena such as Ising superconductivity and the orbital Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. So far, these intriguing states have been accessed only in discrete samples with a fixed set of parameters regarding the spin-orbit coupling strength, lattice symmetry, and dimensionality. Here, we invoke a lithium ion backgate to continuously tune those parameters and reveal a systematic evolution of superconductivity in both ultrathin and bulklike NbSe2 samples. The ultrathin NbSe2 after lithium intercalation possesses a further enhanced upper critical magnetic field over the Pauli limit, confirming the doping dependence of Ising superconductivity. Moreover, we successfully tune the bulklike NbSe2 to a two-dimensional Ising superconductor at high doping. Additionally, at intermediate doping, we observe behaviors akin to the emergent orbital FFLO state.
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. | 5.7 | Pressure not reported | midpoint |
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.2 | Pressure not reported | midpoint |
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