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Fermi surface nesting, as a peculiar reciprocal space feature, is not onlyclosely correlated with the real space superstructure, but also directlymodulates the underlying electronic behavior. In this work, we elucidate theFermi surface nesting feature of the IrSb compound withbuckled-honeycomb-vacancy (BHV) ordering through Rh and Sn doping, and itscorrelation with structure and electronic state evolution. The advantageoussubstitution of atom sites (i.e., Rh on the Ir sites, Sn on the Sb sites,respectively), rather than the direct occupation of vacancies, induces thecollapse of BHV order and the emergence of superconductivity. The distinctsuperconducting behavior of Rh and Sn incorporated systems are ascribed to themismatch of Fermi surface nesting in the Sn case.

Fermi surface nesting, vacancy ordering and the emergence of superconductivity in IrSb compounds