Fig. 2: Emergent superconductivity at the interface between the TbMn6Sn6 sample and the Au film.
From: Emergent superconductivity in topological-kagome-magnet/metal heterostructures
a The evidence of superconductivity for Au film-coated (001) surface of TbMn6Sn6 single-crystal (s7) detected by the standard four-electrode method. The curves are measured at B = 0 T, 0.12 T, 0.145 T, 0.175 T, 0.21 T, 0.25 T, 0.3 T, 0.45 T, 0.7 T, and 1 T, respectively. The magnetic field is applied along the out-of-plane direction (B | |c axis). Inset: the schematic of the standard four-electrode measurements for the TbMn6Sn6/Au film sample. b The magnetoresistance measurements of s7 capped with 10 nm Au film at different temperatures (B | |c axis). Inset: the temperature dependence of normalized resistance at 0.02 T with a drop down to nearly 40% of R6K. c The evidence of superconductivity for Au film-coated side surface of a TbMn6Sn6 single-crystal (s15) detected by the standard four-electrode method. The curves are measured at 0 T, 0.02 T, 0.05 T, 0.09 T, 0.14 T, 0.23 T, 0.37 T, 0.48 T, 0.65 T, 0.85 T, 1.2 T, 1.5 T, and 2.5 T, respectively. The magnetic field is applied perpendicular to the side surface (B⊥c axis). Inset: the schematic of the standard four-electrode measurements for the TbMn6Sn6/Au film sample. d The magnetoresistance measurements of s15 capped with 10 nm Au film on the side surface at different temperatures (B⊥c axis). e The angular dependent magnetoresistance curves of a TbMn6Sn6 sample (s10) capped with 10 nm Au film at 2 K. Here θ is the angle between the magnetic field and c-axis of the TbMn6Sn6 sample. Rn is the magnetoresistance at 3 T when B | |c axis. f Angular dependence of the critical magnetic field Bc(θ) of s10 capped with 10 nm Au film. Inset shows the zoom-in of the Bc(θ) around 90°. The blue curve is the fitting with two-dimensional (2D) Tinkham model (Bc (θ) sin (θ)/Bc//)2 + |Bc(θ)cos(θ)/Bc⊥| = 1 and the red curve is the fitting with the three-dimensional (3D) anisotropic mass model Bc(θ) = Bc///(sin2(θ)+γ2cos2(θ))1/2 with γ = Bc///Bc⊥. Bc is defined as the magnetic field corresponding to 95% normal resistance.
