Fig. 5. Hallmark feature of unconventional superconductivity.

Plot of T_c versus ${\lambda }_{\mathrm{eff}}^{-2}\left(0\right)$ on a logarithmic scale obtained from μSR experiments for Ir_1−δSb, synthesized at 5.5 GPa and Ir_0.7Rh_0.3Sb. The data for the kagome-lattice superconductors KV₃Sb₅^20,21,41, RbV₃Sb₅⁴¹, and LaRu₃Si₂⁴⁶ are also included. The dashed red line represents the relationship obtained for the layered transition metal dichalcogenide superconductors, T_d-MoTe₂ and 2H-NbSe₂ by Guguchia et al.^39,40. The relationship observed for cuprates is shown^36,38 as well as the points for various conventional superconductors.