Reduction of electron-phonon coupling in warm dense iron

被引：10

作者：

Fernandez-Panella, A. ^{[1
]}

Ogitsu, T. ^{[1
]}

Engelhorn, K. ^{[2
]}

Correa, A. A. ^{[1
]}

Barbrel, B. ^{[3
]}

Hamel, S. ^{[1
]}

Prendergast, D. G. ^{[4
]}

Pemmaraju, D. ^{[4
]}

Beckwith, M. A. ^{[1
]}

Bae, L. J. ^{[5
]}

Lee, J. W. ^{[5
]}

Cho, B., I ^{[5
]}

Heimann, P. A. ^{[6
]}

Falcone, R. W. ^{[3
]}

Ping, Y. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[4] Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 USA

[5] Gwangju Inst Sci & Technol, Dept Phys & Photon Sci, Gwangju, South Korea

[6] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA

来源：

PHYSICAL REVIEW B | 2020年 / 101卷 / 18期

基金：

新加坡国家研究基金会;

关键词：

POLYCRYSTALLINE FILMS; RESISTIVITY MODEL; DYNAMICS; METALS; TEMPERATURE; RELAXATION; REFLECTION; FE;

D O I：

10.1103/PhysRevB.101.184309

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The electron-ion relaxation dynamics in warm dense iron were investigated by time-resolved x-ray absorption near-edge spectroscopy (XANES). A novel analysis, combining ab initio density functional theory (DFT) and two temperature model (TTM) simulations, was developed to calculate the x-ray absorption spectra as a function of delay time. Here we present experimental evidence of changes at the XAS L3 edge of iron that are consistent with the reduction of the electron-phonon coupling under warm dense matter conditions. The experimental results are in agreement with the model that takes both the electron (T-e) and the ion temperature (T-i) dependence of the thermophysical properties into consideration, while models where either constant electron-phonon coupling factor (G) or only T-e-dependent G are used do not agree with the observed relaxation dynamics of iron.

引用

页数：11

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