(Color online) Normalized heat current correlation function () for as a function of time. Unlike monoatomic systems, the for and have rapid, regular oscillations.
(Color online) Power spectra of six heat current correlation functions obtained from Fourier transformation. Low temperature spectra are peaked around a single frequency identified with mixed metal-Boron optical phonon modes.
(Color online) Integrated as a function of the upper integration limit , giving both in-plane (x-y plane) and out-of-plane (z-direction) conductivities at for and .
(Color online) In-plane and out-of-plane lattice thermal conductivity as a function of temperature for and . Curves are fits of the data to .
Room temperature properties for single crystal and , where is the density, is the melting temperature, is the Debye temperature, is the velocity of sound calculated from , where is the bulk modulus, is the phonon mean free path calculated from , and is the isotropic lattice thermal conductivity.
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