Existence of Hebel-Slichter peak in unconventional kagome superconductors
arxiv(2024)
摘要
We perform a theoretical investigation of the spin susceptibility of
unconventional superconductivity on the kagome lattice. Despite the existence
of a sign-changing gap structure, which sums to zero over the Fermi surface, we
show that such unconventional pairing states may exhibit a Hebel-Slichter peak
in the temperature-dependent spin-lattice relaxation rate. It originates from
destructive sublattice interference effects. For the same reason,
unconventional pairing states on the kagome lattice tend not to exhibit a
neutron resonance peak. These results supplement previous theoretical studies
of the surprising robustness of sign-changing gap structures to disorder on the
kagome lattice. Taken together these findings imply that unconventional
superconductivity on the kagome lattice is deceptive in the sense that its
properties may appear similar to conventional non-sign-changing
superconductivity. These results may be of relevance to the superconducting
state of the kagome superconductors AV_3Sb_5 (A: K, Rb, Cs) and
CsTi_3Bi_5.
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