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Free electron model

About: Free electron model is a research topic. Over the lifetime, 4678 publications have been published within this topic receiving 103535 citations.


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Journal ArticleDOI
TL;DR: In this paper, the nonadiabatic contributions to the free energy of metals due to the electron-phonon interaction at intermediate temperatures were calculated for four nearly free electron metals, Na, K, Al, and Pb.
Abstract: We calculate the nonadiabatic contributions to the free energy of metals due to the electron-phonon interaction at intermediate temperatures, $0\ensuremath{\leqslant}{k}_{B}Tl{ϵ}_{F}$ for four different nearly free electron metals, Na, K, Al, and Pb We calculate its value for $T=0$ which has not been calculated before and we study its low temperature behavior

27 citations

Journal ArticleDOI
TL;DR: In this paper, the electron momentum distribution at low momenta (<2 atomic units) shows considerable deviation from the free electron gas plus free atom core model, in agreement with recent γ-ray Compton scattering measurements.
Abstract: X-ray Compton scattering measurements on single crystals of aluminium indicate that the electron momentum distribution at low momenta (<2 atomic units) shows considerable deviation from the free electron gas plus free atom core model, in agreement with recent γ-ray Compton scattering measurements. The experimental results show an excess of momentum above the Fermi surface. Better agreement is obtained with the model of Pandey and Lam which includes electron-electron correlation and core orthogonalization effects, but a small discrepancy remains. No evidence of crystalline anisotropy was found in the results obtained from crystals with [110] and [111] scattering vector orientations.

27 citations

Journal ArticleDOI
TL;DR: The finding reveals new physics of thermal conduction, offers a unique platform to probe e‐ph interactions, and provides potential ways to control heat flow in materials with free charge carriers.
Abstract: Charge and thermal transport in a crystal is carried by free electrons and phonons (quantized lattice vibration), the two most fundamental quasiparticles. Above the Debye temperature of the crystal, phonon-mediated thermal conductivity (κ L) is typically limited by mutual scattering of phonons, which results in κ L decreasing with inverse temperature, whereas free electrons play a negligible role in κ L. Here, an unusual case in charge-density-wave tantalum disulfide (1T-TaS2) is reported, in which κ L is limited instead by phonon scattering with free electrons, resulting in a temperature-independent κ L. In this system, the conventional phonon-phonon scattering is alleviated by its uniquely structured phonon dispersions, while unusually strong electron-phonon (e-ph) coupling arises from its Fermi surface strongly nested at wavevectors in which phonons exhibit Kohn anomalies. The unusual temperature dependence of thermal conduction is found as a consequence of these effects. The finding reveals new physics of thermal conduction, offers a unique platform to probe e-ph interactions, and provides potential ways to control heat flow in materials with free charge carriers. The temperature-independent thermal conductivity may also find thermal management application as a special thermal interface material between two systems when the heat conduction between them needs to be maintained at a constant level.

27 citations

Journal ArticleDOI
TL;DR: In this article, the authors present a first-principles calculation of the atomic structure (pair correlation function, static structure factor), the electronic structure (total and partial densities of states), and of the photoemission intensities of liquid Li and Na.
Abstract: The authors present a first-principles calculation of the atomic structure (pair correlation function, static structure factor), the electronic structure (total and partial densities of states), and of the photoemission intensities of liquid Li and Na. They find that in liquid Li the electronic density of states shows a strong structure-induced 'Brillouin-kink' which leads to a pronounced narrowing of the width of the occupied band compared to the prediction of the free electron model. The DOS of liquid Na on the other hand is close to the free electron parabola. The origin of the difference is in the strong p component in the electron-ion potential in Li, but not in Na. The observed deviation of the photoemission spectrum of Na from a free electron form is explained in terms of the partial photoionisation cross-sections. A detailed comparison with experiment shows that the accuracy of the theoretical predictions is limited only by the local density approximation for the many-electron interactions.

27 citations

Journal ArticleDOI
TL;DR: In this paper, two-wavelength interferometry, shadowgraphy and resonance absorption photography were used to investigate the whole laser induced region with each probe-laser pulse, and the results showed spatially-separated regions of high free electron densities and therefore, high temperatures within the plasma plume.

27 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202340
202290
2021132
2020122
2019114
2018112