Fig. 3: Polar magnetic field induced 3D SC to 2D SC transition in 4Hb-TaS2.
From: Signature of magnetoelectric coupling driven finite momentum pairing in 3D ising superconductor
a, b Color maps of \(V\left({B}_{\perp },J\right)\) and \(V\left({B}_{\parallel },J\right)\) at T = 30 mK, respectively. Dark blue region represents the superconducting phase. Inset in (b) shows the experimental setup. The θ represents the polar angle, where \(\theta=0\) and 90° are corresponding to \({B}_{\parallel }\) and \({B}_{\perp }\), respectively. c, Phase separation lines between the superconducting state and normal state at various temperatures. The text denotes the measurement temperature in units of Kelvin. Inset: Typical I-V curves data at 30 mK under B⊥ = 0, 0.4 and 2T. d The polar angle dependence of \({H}_{c2}\left(\theta \right)\). Here \({H}_{c2}\) is defined as the magnetic field where resistivity reaches 50% of its normal state value. Black and red curves are fittings with the anisotropic Ginzburg-Landau model and 2D Tinkham model, respectively. A SC-to-SC transition around \({\theta }_{c} \sim 1^\circ\) is observed. e, f Schematics of Abrikosov vortex lattice under \({B}_{\perp }\) and Josephson vortex under \({B}_{\parallel }\) in 4Hb-TaS2. Due to the Ising superconductivity in the \({{{\mathcal{P}}}}\)-breaking 1H-TaS2, Josephson flux is confined in the \({{{\mathcal{P}}}}\)-preserving 1T-TaS2.
