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

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

Extraordinary role of Zn in enhancing thermoelectric performance of Ga-doped n-type PbTe

2022 ◽  
Author(s):  
Zhong-zhen Luo ◽  
Songting Cai ◽  
Shiqiang Hao ◽  
Trevor Bailey ◽  
Yubo Luo ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carrier Concentration ◽  
Lattice Thermal Conductivity ◽  
Thermoelectric Performance ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Ga Doping ◽  
Role Of Zn

Although Ga doping can weaken the electron phonon coupling of n-type PbTe, Ga-doped PbTe has a relatively low carrier concentration (n) and high lattice thermal conductivity (κlat), resulting in a...

scholarly journals New Insights into the Role of Weak Electron–Phonon Coupling in Nanostructured ZnO Thin Films

Nanomaterials ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 632 ◽  
Author(s):  
Ashish Gandhi ◽  
Wei-Shan Yeoh ◽  
Ming-An Wu ◽  
Ching-Hao Liao ◽  
Dai-Yao Chiu ◽  
...  
Keyword(s):  
Thin Films ◽  
Raman Scattering ◽  
High Performance ◽  
Zno Thin Films ◽  
Phonon Coupling ◽  
X Ray Diffraction ◽  
Electron Phonon Coupling ◽  
Weak Electron ◽  
Confined System

High-quality crystalline nanostructured ZnO thin films were grown on sapphire substrates by reactive sputtering. As-grown and post-annealed films (in air) with various grain sizes (2 to 29 nm) were investigated by scanning electron microscopy, X-ray diffraction, and Raman scattering. The electron–phonon coupling (EPC) strength, deduced from the ratio of the second- to the first-order Raman scattering intensity, diminished by reducing the ZnO grain size, which mainly relates to the Fröhlich interactions. Our finding suggests that in the spatially quantum-confined system the low polar nature leads to weak EPC. The outcome of this study is important for the development of nanoscale high-performance optoelectronic devices.

scholarly journals Raman study of electron-phonon coupling in thin films of the spinel oxide superconductor LiTi2O4

2017 ◽  
Vol 96 (9) ◽  
Author(s):  
D. Chen ◽  
Y.-L. Jia ◽  
T.-T. Zhang ◽  
Z. Fang ◽  
K. Jin ◽  
...  
Keyword(s):  
Thin Films ◽  
Oxide Superconductor ◽  
Phonon Coupling ◽  
Spinel Oxide ◽  
Electron Phonon Coupling ◽  
Raman Study

scholarly journals Creating better superconductors by periodic nanopatterning

2017 ◽  
Vol 3 (2) ◽  
Author(s):  
Milan Allan ◽  
Mark H Fischer ◽  
Oliver Ostojic ◽  
Arjo Andringa
Keyword(s):  
Thin Films ◽  
Transition Temperature ◽  
Numerical Methods ◽  
Model Calculation ◽  
Lattice Mismatch ◽  
Specific Pattern ◽  
Design Parameters ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Correct Design

The quest to create superconductors with higher transition temperatures is as old as superconductivity itself. One strategy, popular after the realization that (conventional) superconductivity is mediated by phonons, is to chemically combine different elements within the crystalline unit cell to maximize the electron-phonon coupling. This led to the discovery of NbTi and Nb_33Sn, to name just the most technologically relevant examples. Here, we propose a radically different approach to transform a ‘pristine’ material into a better (meta-) superconductor by making use of modern fabrication techniques: designing and engineering the electronic properties of thin films via periodic patterning on the nanoscale. We present a model calculation to explore the key effects of different supercells that could be fabricated using nanofabrication or deliberate lattice mismatch, and demonstrate that specific pattern will enhance the coupling and the transition temperature. We also discuss how numerical methods could predict the correct design parameters to improve superconductivity in materials including Al, NbTi, and MgB_22.

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