INFLUENCE OF THE ANISOTROPY OF ELECTRON-PHONON SCATTERING ON THE LOW TEMPERATURE RESISTIVITY OF NORMAL METALS

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-1052-C6-1053
Author(s):  
R. Krsnik ◽  
E. Babić
Keyword(s):  
Low Temperature ◽  
Phonon Scattering ◽  
Normal Metals ◽  
Temperature Resistivity ◽  
Electron Phonon Scattering

Normal metal point contacts

1982 ◽  
Vol 60 (5) ◽  
pp. 740-745 ◽  
Author(s):  
H. van Kempen
Keyword(s):  
Electron Scattering ◽  
Kondo Effect ◽  
Phonon Scattering ◽  
Point Contact ◽  
High Current ◽  
Point Contacts ◽  
Paramagnetic Impurities ◽  
Normal Metals ◽  
Current Densities ◽  
Electron Phonon Scattering

Under conditions of extremely high current densities, deviations from the linear current (I) – voltage (V) relation (Ohm's law) occur in normal metals. One can obtain sufficiently high current densities (of the order of 1010 A/cm2) by applying a voltage to a point contact. The nonlinear Boltzmann equation relates the nonlinearities to the energy dependence of the electron scattering probabilities. It is shown, for example, that d2V/dI2 is proportional to α2(ω)F(ω), where F(ω) is the phonon density of states and α(ω) is the electron–phonon scattering matrix element. In addition other interactions arc studied by this method such as electron–magnon interaction and the interaction of electrons with paramagnetic impurities, the well-known Kondo effect. A double point contact geometry is described which allows electron–surface scattering to be studied.

Electron-phonon Scattering Effect on Strained Si Nanowire FETs at Low Temperature

2019 ◽  
Vol 25 (6) ◽  
pp. 439-443
Author(s):  
Ikushin Tsuchida ◽  
Aya Seike ◽  
Hajime Takai ◽  
Junichi Masuda ◽  
Daisuke Kosemura ◽  
...  
Keyword(s):  
Low Temperature ◽  
Phonon Scattering ◽  
Strained Si ◽  
Si Nanowire ◽  
Scattering Effect ◽  
Electron Phonon Scattering

scholarly journals Thermoelectric Power of Gd4(Co-A)3 Compounds (A = Cu, Pt)

2012 ◽  
Vol 730-732 ◽  
pp. 159-163
Author(s):  
Teresa M. Seixas ◽  
Manuel A. Salgueiro da Silva ◽  
Hans F. Braun ◽  
Georg Eska
Keyword(s):  
Low Temperature ◽  
Thermoelectric Power ◽  
Phonon Scattering ◽  
Positive Maximum ◽  
Spin Disorder ◽  
Structure Changes ◽  
Power Measurements ◽  
Electron Band Structure ◽  
Electron Phonon Scattering

We report on a comparative study of thermoelectric power measurements (S(T)) in ferrimagnetic Gd4(Co1-xAx)3 compounds with A = Cu, Pt, in the temperature range 8 K – 300 K. Whereas in Gd4Co3S(T) is always negative, for x > 0 the substitution of Co for Cu/Pt gives rise to the appearance of a low temperature positive maximum in S(T) at around 30 K. Based on our previous study of Gd4(Co1-xCux)3 compounds, we argue that this maximum in S(T) originates from electron-magnon scattering and is sensitive to electron band structure changes resulting from the substitution of Co for Cu/Pt and the accompanying reduction in the ratio between the electron-magnon and the electron-phonon scattering strengths. The decreasing role of Co 3d electrons with the progressive substitution of Co for Cu/Pt, evidenced by a strong reduction in the spin disorder resistivity and the Co magnetic moment, is seen to be crucial for the existence of such low temperature maximum in S(T) for x > 0. It is seen that the substitution of Co for Pt leads to higher values of the amplitude and temperature of the positive maximum in S(T) than the substitution of Co for Cu.

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