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RhPb was initially recognized as one of a CoSn-like compounds with $P6/mmm$symmetry, containing an ideal kagome lattice of $d$-block atoms. However,theoretical calculations predict the realization of the phonon soft mode whichleads to the kagome lattice distortion and stabilization of the structure with$P\bar{6}2m$ symmetry [A. Ptok et al., Phys. Rev. B 104, 054305 (2021)]. Here,we present the single crystal x-ray diffraction results supporting thisprediction. Furthermore, we discuss the main dynamical properties of RhPb with$P\bar{6}2m$ symmetry. The bulk phononic dispersion curves contain severalflattened bands, Dirac nodal lines, and triple degenerate Dirac points. As aconsequence, the phononic drumhead surface state is realized for the (100)surface, terminated by the zigzag-like edge of Pb honeycomb sublattice.

Phononic drumhead surface state in distorted kagome compound RhPb