Microscopic Origin of the Ultralow Lattice Thermal Conductivity in Vacancy-Ordered Halide Double Perovskites Cs${}_{2}B{X}_6$ ($B$ = Zr, Pd, Sn, Te, Hf, and Pt; $X$= Cl, Br, and I)

Lingzhi Cao, Yateng Wang, Zhonghao Xia +1

Vacancy-ordered halide double perovskites Cs${}_{2}B{X}_6$ have recently attracted significant attention due to their intrinsically ultralow lattice thermal conductivity ($κ_{\mathrm{L}}…