Electron-phonon interaction in aluminum from ultrasonic attenuation measurements

1972 ◽  
Vol 7 (5-6) ◽  
pp. 399-414 ◽  
Author(s):  
B. Berre ◽  
A. Vetleseter
Keyword(s):  
Ultrasonic Attenuation ◽  
Phonon Interaction ◽  
Electron Phonon Interaction

Charge Transport and Ultrasonic Properties of La1/3Sr2/3Fe0.95Co0.05O3Perovskite

2012 ◽  
Vol 482-484 ◽  
pp. 819-823
Author(s):  
Hui Kong ◽  
Wei Dai ◽  
Shuai Shao
Keyword(s):  
Single Phase ◽  
Ultrasonic Attenuation ◽  
Charge Ordering ◽  
Simultaneous Occurrence ◽  
Phonon Interaction ◽  
Strong Electron ◽  
Electron Phonon Interaction ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Ordering Transition

The longitudinal ultrasonic velocity (V) and attenuation at a frequency of 10MHz have been measured in single-phase polycrystalline La1/3Sr2/3Fe0.95Co0.05O3 from 20K to 300K. The temperature dependence of resistivity indicates that La1/3Sr2/3Fe0.95Co0.05O3 undergoes charge ordering transition at TCO. A dramatic increase in V is observed at TCO, which is accompanied by a sharp peak in attenuation. This simultaneous occurrence of resistivity and ultrasonic anomalous features implies extremely strong electron-phonon interaction, which is due to the the Jahn-Teller effect of high-spin Fe4+. Below TCO, another softening in V accompanied by a wide ultrasonic attenuation peak is observed. The analysis of the results suggests that these anomalies may correspond to the breathing-type distortion of Fe-O octahedron.

Alternative Superconducting Ground States

1960 ◽  
Vol 13 (2) ◽  
pp. 446 ◽  
Author(s):  
JC Fisher
Keyword(s):  
Matrix Element ◽  
Ground State ◽  
Ultrasonic Attenuation ◽  
Spin Projection ◽  
Nuclear Spin Relaxation ◽  
Detailed Knowledge ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Spin Paramagnetism ◽  
Rule Out

A comparison is made between (a) the trial ground state composed of a linear combination of normal state configurations in which individual electron states of opposite momentum and equal spin projection (k t, -k t) and (k t, -k t), abbreviated (kcr, -kcr), are both either occupied or unoccupied, and (b) the trial ground state with (k t , -k t ) pairing proposed by Bardeen, Cooper, and Schrieffer. The two trial states lead to identical thermodynamics as long as an average matrix element -V = < Vkle' >av is treated as a disposable parameter. They lead to similar coherence effects for ultrasonic attenuation and nuclear spin relaxation. They differ in that spin paramagnetism is predicted for (kcr, -kcr) pairing. Detailed knowledge of the electron-phonon interaction in superconductors seems at present inadequate to rule out either possibility for all superconductors.

The simulation of the electron-phonon interaction in silicon

2018 ◽  
Vol 30 (12) ◽  
pp. 3-16
Author(s):  
A. Berezin ◽  
◽  
Yu. Volkov ◽  
M. Markov ◽  
I. Tarakanov ◽  
...  
Keyword(s):  
Phonon Interaction ◽  
Electron Phonon Interaction
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