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<p>The transition metal dichalcogenide 6R-TaS<sub>2</sub> is a rich quantum platform hosting charge density wave (CDW) order, superconductivity, and an additional temperature scale at <i>T</i><sup>*</sup>&#xa0;≃&#xa0;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 <i>T</i><sup>*</sup>. 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-TaS<sub>2</sub>, driven by weakened interlayer coupling and shared electronic states.</p>

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Competing quantum orders in 6R-TaS2 revealed by pressure

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月30日

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  • V. Sazgari,
  • J. N. Graham,
  • S. S. Islam,
  • A. Achari,
  • P. Král,
  • O. Gerguri,
  • J. N. Tangermann,
  • J. A. Krieger,
  • H. Gopakumar,
  • G. Simutis,
  • M. Janoschek,
  • M. Bartkowiak,
  • J.-X. Yin,
  • R. Khasanov,
  • H. Luetkens,
  • F. O. von Rohr,
  • R. R. Nair,
  • Z. Guguchia

摘要

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.