Thermal conductance of metal-diamond interfaces at high pressure
Thermal conductance of metal-diamond interfaces at high pressure
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DOI：
10.1038/ncomms7578
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发表时间：
2015-03-01
影响因子：
16.6
通讯作者：
Cahill, David G.
中科院分区：
文献类型：
--
作者：
Hohensee, Gregory T.;Wilson, R. B.;Cahill, David G.
金属和金刚石之间的界面具有相对较高的德拜温度，其热导率通常大于双声子过程所能解释的。在金刚石砧胞（DAC）中实现的高压可以显着将金属声子态密度扩展到更高的频率，并且还可以通过大大加强界面键合来抑制外部效应。本文报道了沉积在1A型天然[100]和2A型合成[110]金刚石砧上的Pb、au0.95、pd0.05、Pt和Al薄膜在DAC中高达50 GPa的金属-金刚石界面热导的时域热反射测量结果。在所有情况下，热导率在高压下微弱地增加或饱和到类似的值。我们的研究结果表明，金属-金刚石界面上的非谐波电导是由部分传输过程控制的，其中在界面上非弹性散射的金刚石声子吸收或发射金属声子。
The thermal conductance of interfaces between metals and diamond, which has a comparatively high Debye temperature, is often greater than can be accounted for by two-phonon processes. The high pressures achievable in a diamond anvil cell (DAC) can significantly extend the metal phonon density of states to higher frequencies, and can also suppress extrinsic effects by greatly stiffening interface bonding. Here we report time-domain thermoreflectance measurements of metal-diamond interface thermal conductance up to 50 GPa in the DAC for Pb, Au0.95Pd0.05, Pt and Al films deposited on type 1A natural [100] and type 2A synthetic [110] diamond anvils. In all cases, the thermal conductances increase weakly or saturate to similar values at high pressure. Our results suggest that anharmonic conductance at metal-diamond interfaces is controlled by partial transmission processes, where a diamond phonon that inelastically scatters at the interface absorbs or emits a metal phonon.