Abstract
The transition metal dichalcogenide 6R-TaS2 is a rich quantum platform hosting charge density wave (CDW) order, superconductivity, and an additional temperature scale at T* ≃ 40 K marked by pronounced magnetoresistance and a nonlinear Hall effect (NHE). However, the nature of the superconducting pairing, the origin of the NHE, and their relationship with the CDW remain unclear. Using muon-spin rotation, magnetotransport and hydrostatic pressure techniques, we identify a nodal superconducting state with low superfluid density at ambient pressure, with no spontaneous magnetic order detected below T*. This rules out magnetism as the origin of the NHE. Under pressures up to 2 GPa, the superfluid density rises markedly in correlation with the superconducting transition temperature, the nodal pairing shifts to a nodeless state, and the CDW onset is reduced by half. Notably, the NHE is fully suppressed and magnetoresistance drops by 50% within just 0.2 GPa, highlighting the fragility of the state with NHE. These results reveal competition between superconductivity, charge order, and the nonlinear Hall effect in 6R-TaS2, driven by weakened interlayer coupling and shared electronic states.
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Acknowledgements
The μSR experiments were carried out at the Swiss Muon Source (SμS), Paul Scherrer Institute, Villigen, Switzerland. Z.G. acknowledges support from the Swiss National Science Foundation (SNSF) through SNSF Starting Grant (No. TMSGI2_211750). A.A. and R.R.N. acknowledge the support provided by The Leverhulme Trust (PLP-2018-220), the Engineering and Physical Sciences Research Council (EP/N005082/1), and the Royal Academy of Engineering through the Research Chairs and Senior Research Fellowships programme (RCSRF2223-1671). A.A. and R.R.N. also acknowledge the use of facilities at the Henry Royce Institute for Advanced Materials, which is funded by EPSRC grants EP/R00661X/1, EP/S019367/1, EP/P025021/1 and EP/P025498/1.
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Sazgari, V., Graham, J.N., Islam, S.S. et al. Competing quantum orders in 6R-TaS2 revealed by pressure. Nat Commun (2026). https://doi.org/10.1038/s41467-026-72136-x
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DOI: https://doi.org/10.1038/s41467-026-72136-x
