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首页> 外文期刊>Applied Surface Science >Temperature dependences of the electron-phonon coupling, electron heat capacity and thermal conductivity in Ni under femtosecond laser irradiation
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Temperature dependences of the electron-phonon coupling, electron heat capacity and thermal conductivity in Ni under femtosecond laser irradiation

机译：飞秒激光辐照下镍中电子-声子耦合，电子热容量和导热系数的温度依赖性

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摘要

The electron temperature dependences of the electron-phonon coupling factor, electron heat capacity and thermal conductivity are investigated for Ni in a range of temperatures typically realized in femtosecond laser material processing applications, from room temperature up to temperatures of the order of 10~4 K. The analysis is based on the electronic density of states obtained through the electronic structure calculations. Thermal excitation of d band electrons is found to result in a significant decrease in the strength of the electron-phonon coupling, as well as large deviations of the electron heat capacity and the electron thermal conductivity from the commonly used linear temperature dependences on the electron temperature. Results of the simulations performed with the two-temperature model demonstrate that the temperature dependence of the thermophysical parameters accounting for the thermal excitation of d band electrons leads to higher maximum lattice and electron temperatures achieved at the surface of an irradiated Ni target and brings the threshold fluences for surface melting closer to the experimentally measured values as compared to the predictions obtained with commonly used approximations of the thermophysical parameters.
机译：在飞秒激光材料加工应用中通常实现的温度范围内，从室温到10〜4 K量级的温度下，研究了Ni对电子-声子耦合因子，电子热容量和导热率的电子温度依赖性。该分析基于通过电子结构计算获得的状态的电子密度。发现d带电子的热激发导致电子-声子耦合强度的显着降低，以及电子热容量和电子热导率相对于通常依赖于电子温度的线性温度的较大偏差。 。用两个温度模型进行的仿真结果表明，考虑了d带电子热激发的热物理参数的温度依赖性导致在被辐照的Ni目标表面达到更高的最大晶格和电子温度，并带来阈值。与通常使用热物理参数的近似值得出的预测值相比，表面熔化的能量密度更接近于实验测量值。

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