scholarly journals First-principles determination of the ultrahigh electrical and thermal conductivity in free-electron metals via pressure tuning the electron-phonon coupling factor

2019 ◽  
Vol 99 (16) ◽  
Author(s):  
Ashutosh Giri ◽  
John T. Gaskins ◽  
Linqiu Li ◽  
Yi-Siang Wang ◽  
Oleg V. Prezhdo ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
First Principles ◽  
Free Electron ◽  
Coupling Factor ◽  
Phonon Coupling ◽  
Pressure Tuning ◽  
Electron Phonon Coupling

Large electronic sputtering yield of nanodimensional Au thin films: Dominant role of thermal conductivity and electron phonon coupling factor

2017 ◽  
Vol 121 (9) ◽  
pp. 095308 ◽  
Author(s):  
Udai B. Singh ◽  
Compesh Pannu ◽  
Dinesh C. Agarwal ◽  
Sunil Ojha ◽  
Saif A. Khan ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Dominant Role ◽  
Coupling Factor ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Sputtering Yield ◽  
Au Thin Films

scholarly journals A first-principles study of the effects of electron–phonon coupling on the thermoelectric properties: a case study of the SiGe compound

2018 ◽  
Vol 6 (25) ◽  
pp. 12125-12131 ◽  
Author(s):  
D. D. Fan ◽  
H. J. Liu ◽  
L. Cheng ◽  
J. H. Liang ◽  
P. H. Jiang
Keyword(s):  
Thermal Conductivity ◽  
Carrier Concentration ◽  
First Principles ◽  
Figure Of Merit ◽  
Lattice Thermal Conductivity ◽  
Thermoelectric Figure Of Merit ◽  
Phonon Coupling ◽  
Thermoelectric Figure ◽  
Electron Phonon Coupling

The lattice thermal conductivity of the SiGe compound can be significantly reduced by electron–phonon coupling at higher carrier concentration, which in turn obviously enhances its thermoelectric figure-of-merit.

scholarly journals Electron-Phonon Coupling Parameter of Ferromagnetic Metal Fe and Co

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2755
Author(s):  
Kyuhwe Kang ◽  
Gyung-Min Choi
Keyword(s):  
Coupling Parameter ◽  
Critical Role ◽  
Circuit Modeling ◽  
Metallic Materials ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Complicated Process ◽  
G Value ◽  
Non Equilibrium

The electron-phonon coupling (g) parameter plays a critical role in the ultrafast transport of heat, charge, and spin in metallic materials. However, the exact determination of the g parameter is challenging because of the complicated process during the non-equilibrium state. In this study, we investigate the g parameters of ferromagnetic 3d transition metal (FM) layers, Fe and Co, using time-domain thermoreflectance. We measure a transient increase in temperature of Au in an FM/Au bilayer; the Au layer efficiently detects the strong heat flow during the non-equilibrium between electrons and phonons in FM. The g parameter of the FM is determined by analyzing the temperature dynamics using thermal circuit modeling. The determined g values are 8.8–9.4 × 1017 W m−3 K−1 for Fe and 9.6–12.2 × 1017 W m−3 K−1 for Co. Our results demonstrate that all 3d transition FMs have a similar g value, in the order of 1018 W m−3 K−1.

Role of electron–phonon coupling in thermal conductivity of metallic nanofluids

2019 ◽  
Vol 52 (48) ◽  
pp. 485302 ◽  
Author(s):  
Dong-Xing Song ◽  
Yu-Feng Zhang ◽  
Wei-Gang Ma ◽  
Xing Zhang
Keyword(s):  
Thermal Conductivity ◽  
Phonon Coupling ◽  
Electron Phonon Coupling
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