We measure the electrical resistivity of hcp-iron up to ~ 170 GPa and ~ 3,000 K using a four-probe van der Pauw method coupled with homogeneous flat-top laser-heating in a DAC, and compute its electrical and thermal conductivity by first-principles molecular dynamics including electron-phonon and electron-electron scattering. We find that the measured resistivity of hcp-iron increases almost linearly with temperature, and is consistent with our computations. The results constrain the resistivity and thermal conductivity of hcp-iron to ~ 805 $$cm and ~ 10010 W/mK, respectively, at conditions near the core-mantle boundary. Our results indicate an adiabatic heat flow of ~ 101 TW out of the core, supporting a present-day geodynamo driven by thermal and compositional convection.

中文翻译：

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铁和大地磁传递特性实验与理论的对账

我们使用四探针van der Pauw方法结合DAC中均匀的平顶激光加热，测量了高达〜170 GPa和〜3,000 K的hcp铁的电阻率，并通过以下方法计算其电导率和热导率：原理分子动力学包括电子-声子和电子-电子散射。我们发现，测得的hcp-铁的电阻率几乎随温度线性增加，并且与我们的计算结果一致。结果将hcp铁的电阻率和热导率分别限制在靠近芯-幔边界的条件下，分别约为805 $$ cm和10010 W / mK。我们的结果表明，绝热约101 TW的热量从岩心流出，支持了当今由热对流和成分对流驱动的大地发电机。