The interaction of electrons with ultrasonic shear waves in copper

1970 ◽  
Vol 48 (1) ◽  
pp. 13-20 ◽  
Author(s):  
A. M. Simpson ◽  
M. H. Jericho
Keyword(s):  
Fermi Surface ◽  
Magnetic Field Dependence ◽  
Surface Deformation ◽  
Shear Waves ◽  
Theoretical Description ◽  
Sound Waves ◽  
Conduction Electrons ◽  
Strong Polarization ◽  
Ultrasonic Shear ◽  
The Magnetic Field

Measurements of the electronic component of the acoustic attenuation of shear waves travelling in the [110] direction in copper are reported. The magnetic field dependence of the attenuation has also been investigated in fields up to 50 kG. The data have been compared with theory on the basis of a simple examination of the Fermi surface of copper. The results show strong polarization dependence of the attenuation and suggest that when [math], a detailed theoretical description will require consideration of electromagnetic as well as Fermi surface deformation interactions of sound waves with the conduction electrons.

Effect of magnetic fields on the anomalous shear ultrasonic attenuation peak in Ho

1976 ◽  
Vol 54 (11) ◽  
pp. 1172-1177 ◽  
Author(s):  
A. M. Simpson ◽  
M. H. Jericho ◽  
M. C. Jain
Keyword(s):  
Magnetic Field ◽  
Single Crystals ◽  
Field Dependence ◽  
Basal Plane ◽  
Magnetic Field Dependence ◽  
Ultrasonic Attenuation ◽  
Sound Waves ◽  
Ultrasonic Shear ◽  
Anomalous Attenuation ◽  
The Magnetic Field

The magnetic field dependence of the anomalous attenuation peak for ultrasonic shear waves propagating along the c axis in Ho single crystals near 90 K has been studied. We find that a magnetic field has a pronounced effect on the attenuation peak and that for certain field orientations the attenuation anomaly disappears altogether. For some field orientations the attenuation showed hysteresis effects when the field was cycled. We have also found evidence for considerable rotation of the plane of polarization of the sound waves when the field was near the c axis or the basal plane. It is hoped that the results will contribute to the understanding of the nature of the attenuation anomaly.

scholarly journals Fermi Surface Deformation Near Charge-Ordering Transition

2011 ◽  
Vol 80 (12) ◽  
pp. 123707 ◽  
Author(s):  
Kazuyoshi Yoshimi ◽  
Takeo Kato ◽  
Hideaki Maebashi
Keyword(s):  
Fermi Surface ◽  
Surface Deformation ◽  
Charge Ordering ◽  
Ordering Transition

MAGNETIC FIELD DEPENDENCE OF CRITICAL CURRENTS IN SUPERCONDUCTING POLYCRYSTALS

1992 ◽  
Vol 06 (03) ◽  
pp. 161-169 ◽  
Author(s):  
K.I. KUGEL ◽  
T. YU. LISOVSKAYA ◽  
R.G. MINTS
Keyword(s):  
Magnetic Field ◽  
Magnetic Field Dependence ◽  
Asymptotic Form ◽  
Critical Currents ◽  
Transport Current ◽  
Wide Field ◽  
London Penetration Depth ◽  
Field Range ◽  
Crystallographic Axes ◽  
The Magnetic Field

We study the dependence of critical current j c on magnetic field H in superconducting polycrystals which are considered as systems of superconducting crystallites (isotropic or anisotropic) with Josephson contacts between them. Isotropy or anisotropy of contacts depends on the orientation of their crystallographic axes relatively to edges of contact planes. It is shown that for a system of randomly oriented isotropic contacts, the dependence j c (H) in a relatively wide field range has the asymptotic form j c ~( ln H)/H2. This differs drastically from j c (H) for single contacts. Anisotropy effects due to large differences in London penetration depth λ values corresponding to external magnetic field directed along different axes are analyzed in detail. It is shown that for uniaxal crystals with λ1=λ2≪λ3, this anisotropy leads to the relation [Formula: see text] for chaotic orientation of crystallites. The form of j c (H) curves for two different orientations of the magnetic field relatively to the transport current through the sample is found.

NON-LINEAR INTERACTION BETWEEN ULTRASONIC SHEAR WAVES AND DISLOCATIONS IN ALUMINIUM

1981 ◽  
Vol 42 (C5) ◽  
pp. C5-387-C5-392 ◽  
Author(s):  
Y. T. Wang ◽  
W. G.B. Britton ◽  
R. W.B. Stephens
Keyword(s):  
Shear Waves ◽  
Linear Interaction ◽  
Non Linear ◽  
Ultrasonic Shear

The magnetic field dependence of the low temperature (0.1K to 3K) residual specific heat of Pr2−x Ce x CuO4−δ

1996 ◽  
Vol 46 (S3) ◽  
pp. 1213-1214 ◽  
Author(s):  
T. E. Hargreaves ◽  
J. Akimitsu ◽  
D. F. Brewer ◽  
N. E. Hussey ◽  
H. Noma ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Specific Heat ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
The Magnetic Field

scholarly journals Спонтанный спиновый магнетизм донорных электронов проводимости гибридизированных состояний кристалла, образованных системой примесных атомов 3d-элементов низкой концентрации (<1 at.%)

2022 ◽  
Vol 64 (1) ◽  
pp. 60
Author(s):  
Т.Е. Говоркова ◽  
В.И. Окулов
Keyword(s):  
Spin Polarization ◽  
Transition Element ◽  
Electron System ◽  
Experimental Proof ◽  
Theoretical Concepts ◽  
Conduction Electrons ◽  
Impurity Atoms ◽  
Mercury Selenide ◽  
The Given ◽  
The Magnetic Field

The given work is devoted to the experimental proof of existing the spontaneous spin polarization of the donor electron system of 3d-transition element impurity atoms of low concentration (<1 at.%) in a mercury selenide crystal. For this purpose there have been measured the dependences of the magnetization on the magnetic field strength. As a result of the analysis of the obtained dependences, there were extracted the impurity contributions, which are described by the magnetization curves typical of the ferromagnets, and by the magnetic parameters conforming to the spontaneous magnetism of the systems under study, which are unambiguously related to the donor conduction electrons of the outer d-shells of impurity atoms. By its nature, according to the developed theoretical concepts, the spontaneous spin polarization manifests itself in exchange interaction, taking place in hybridizing the electronic states of the impurity atom and the conduction band ones of the crystal.

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