In the tutorials, we see that MgB2 has a well separated superconducting gaps in both delta vs T plot and quasiparticle density of state plot. However, in case of NbSe2 (S. Das et. al. npj Computational Materials (2023) 66) and MoTe2 (Hari Paudyal et. al. PHYSICAL REVIEW B 101, 214515 (2020)) , the papers seem to indicate the presence of multiple gaps although not directly evident from the plots (may be its just me).
Is there any thumb rule or any characteristic features which we need to see in the plots to decide whether a material has single or multiple gaps? Any leads would be of great help.
understanding the superconducting gap vs T plot
Moderator: stiwari