Effect of anisotropic parameters on some properties of the vHs superconductor in kagome materials

Abstract

In this work, we use the anisotropy energy gap and the van Hove singularity in the density of states to define various properties of multilayer kagome superconductors in the weak coupling limit. The multilayer characteristics of kagome superconductors can be represented using either the Haas and Maki anisotropic model (HM) or the Posazhennikova, Dahm, and Maki model (PDM). We found that the HM model is better suited for characterizing kagome superconductors than the PDM model. Following these calculations, the isotope effect exponent, gap-to-T<inf>c</inf> ratio, and specific heat jump were investigated using equations and numerical data. The isotope exponent (0.12) and specific heat jump (0.88–1.33) are both lower than BCS predictions; however, the gap-to-T<inf>c</inf> ratio (5.32–5.68) exceeds BCS expectations.