Thermal conductivity of condensed gold in states with the strongly excited electron subsystem

30th International Conference on Interaction of Intense Energy Fluxes with Matter

Petrov, Yu.V.^1,2 ; Inogamov, N.A.^1 ; Anisimov, S.I.^1 ; Migdal, K.P.^3 ; Khokhlov, V.A.^1 ; Khishchenko, K.V.^2,4

Landau Institute for Theoretical Physics, Russian Academy of Scienses, Akademika Semenova 1a, Chernogolovka, Moscow Region

142432, Russia^1

Moscow Institute of Physics and Technology, Institutskiy Pereulok 9, Dolgoprudny, Moscow Region

141700, Russia^2

All-Russia Scientific Research Institute of Automatics, Sushchevskaya 22, Moscow

127055, Russia^3

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13, Moscow

125412, Russia^4

关键词: Analytical expressions;    Behavior of matters;    Calculations of the electronic spectrum;    Density-functional methods;    Excited electrons;    Kinetic equations;    Temperature phase;    Three dimensional space;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/653/1/012087/pdf
DOI  :  10.1088/1742-6596/653/1/012087

来源: IOP

【 摘 要 】

Data on thermal conductivity in states with hot electrons are necessary for the calculation of ultrashort laser exposure and the behavior of matter near the tracks of fast particles penetrating the condensed phase. The paper presents new analytical expressions describing the state of gold with the extra-high heat conductivity within a broad range of two-temperature phase diagram including the melting curve. This is a region in the threedimensional space defined by the electron temperature Te, ion temperature Tiand the density ρ, at which the thermal conductivity κ is one order of magnitude larger than the value related to the room temperature. The growth of heat transfer is due to a sharp increase in the heat capacity of carriers (electrons) when they are heated and, accordingly, the gradual loss of the degeneracy. The developed model is based on an exact solution of the kinetic equation, involving experimental data and calculations of the electronic spectrum by the density functional method. The model works well also at low temperatures Tethat allows describing the crystallization of the melt as it cools down.