Nodal and Nematic Superconducting Phases in NbSe2 Monolayers from Competing Superconducting Channels
Chang-woo Cho, Jian Lyu, Liheng An, Tianyi Han, Kwan To Lo, Cheuk Yin Ng, Jiaqi Hu, Yuxiang Gao, Gaomin Li, Mingyuan Huang, Ning Wang, Jörg Schmalian, Rolf Lortz
DOI 10.1103/PhysRevLett.129.087002 · Physical Review Letters
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Abstract
Transition metal dichalcogenides like 2H−NbSe2 in their two-dimensional (2D) form exhibit Ising superconductivity with the quasiparticle spins being firmly pinned in the direction perpendicular to the basal plane. This enables them to withstand exceptionally high magnetic fields beyond the Pauli limit for superconductivity. Using field-angle-resolved magnetoresistance experiments for fields rotated in the basal plane we investigate the field-angle dependence of the upper critical field (Hc2), which directly reflects the symmetry of the superconducting order parameter. We observe a sixfold nodal symmetry superposed on a twofold symmetry. This agrees with theoretical predictions of a nodal topological superconducting phase near Hc2, together with a nematic superconducting state. We demonstrate that in NbSe2 such unconventional superconducting states can arise from the presence of several competing superconducting channels.
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. | 7.2 | Pressure not reported | unknown |
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.4 | Pressure not reported | onset |
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