Existence of Hebel-Slichter peak in unconventional kagome superconductors

The type of superconducting pairing symmetry realized in recently discovered kagome metals remains an open question at present. Here, the authors theoretically investigate the spin-lattice relaxation rate of unconventional superconductivity on the kagome lattice, and demonstrate the existence of a Hebel-Slichter peak for $d$-wave superconductivity. They explain this result from a peculiar sublattice interference effect present on the kagome lattice. This study shows the surprising effect that unconventional kagome superconductors can behave similar to conventional $s$-wave superconductors.