Fig. 1: Lattice thermal conductivity and crystal structure of CuP2.
From: Dimer rattling mode induced low thermal conductivity in an excellent acoustic conductor
a A survey of lattice thermal conductivity of disorder-free materials vs. mean sound speed vm. The detailed data are listed in Supplementary Table 1 (for polycrystalline samples, please refer to Supplementary Fig. 1 and Table 2). b Temperature dependence of the lattice thermal conductivity of the CuP2 single crystal is shown from 50 to 300 K measured by a steady-state comparative method. The inset shows the data near room temperature. The error bars indicate the uncertainty (see “Methods”). c The layered structure with Cu dimer layers and P network layers are highlighted. The arrows in orange on Cu atoms represent the vibrational directions at the Γ point of the optical phonon mode located at about 11 meV (see Fig. 4). The atomic motions of this mode are also displayed in Supplementary Movie 1. d The isolated Cu dimer layers with intra- and inter-dimer distances labeled.
