Optical-Phonon-Enabled Large Lattice Thermal Conductivity Anisotropy in Hexagonal Perovskites Cs$B{X}_3$ ($B$ = Mg, Cd; $X$ = Cl, Br, I)

Lingzhi Cao, Ying Song, Zhonghao Xia +2

Materials exhibiting strongly anisotropic lattice thermal conductivity are desirable for thermal-management applications, yet such behavior is commonly associated with layered or q…