Accepted Wednesday Nov 04, 2009
The physics of heat conduction in layered, anisotropic crystals is probed by measurements of the cross-plane elastic constant C33 and thermal conductivity \Lambda of muscovite mica as a function of hydrostatic pressure. Picosecond interferometry and time-domain thermoreflectance provide high precision measurements of C33 and \Lambda, respectively, of micron-sized samples within a diamond anvil cell; \Lambda changes from the anomalously low value of 0.46 W m-1 K-1 at ambient pressure to a value more typical of oxides crystals with large unit cells, 6.6 W m-1 K-1, at P=24 GPa. Most of the pressure dependence of \Lambda can be accounted for by the pressure dependence of the cross-plane sound velocities.