Magnetic Field Dependence of the Thermoelectric Power of Iron

1972 ◽  
Vol 50 (22) ◽  
pp. 2836-2839 ◽  
Author(s):  
F. J. Blatt
Keyword(s):  
Magnetic Field ◽  
Thermoelectric Power ◽  
Magnetic Field Dependence ◽  
Cold Work ◽  
Transverse Magnetic ◽  
Band Model ◽  
Spin Orbit Coupling ◽  
Phonon Drag ◽  
Domain Alignment ◽  
Two Band Model

The thermoelectric power of iron exhibits a broad maximum of about 17 µV/K near 200 K. The relatively high temperature of this maxim and its dependence on alloying and cold work argue against phonon drag as the mechanism responsible for this peak. Recently, MacInnes and Schröder proposed that this peak derives from anisotropic (scew) scattering due to spin–orbit coupling, which may be simulated by a large effective transverse magnetic field. Their calculations, which reproduce experimental observations quite well, are based on an expression derived by Sondheimer that is valid for an ideal two-band model. According to this model and the suggestion of MacInnes and Schröder, the thermoèlectric power of iron should be strongly influenced by domain alignment. Measurements of the dependence of the thermoelectric power of iron in transverse and longitudinal magnetic fields reported here yield results contrary to the predictions of that model.

Thermoelectric Power of the Liquid Sn—Te Alloy

1982 ◽  
Vol 37 (10) ◽  
pp. 1127-1131 ◽  
Author(s):  
D. H. Kurlat ◽  
M. Rosen
Keyword(s):  
Thermoelectric Power ◽  
Hard Sphere ◽  
Stoichiometric Composition ◽  
Band Model ◽  
Liquid Alloys ◽  
Sphere Approximation ◽  
The Difference ◽  
Predicted Values ◽  
Experimental Values ◽  
Two Band Model

The Seebeck coefficient (S) of Sni1-x- Tex liquid alloys was measured as a function of concentration and temperature. For 0 ≦ x <0.45 the behaviour is metallic; S values are small and negative, rising linearly with temperature. The predicted values of Ziman's theory when using the hard sphere approximation disagree with the experimental ones. The change in sign occurs for 0.45. For x = 0.5 (stoichiometric composition) the thermoelectric power decreases linearly with temperature. This fact is explained assuming a two-band model. For x ≧ 0.6 the liquid alloy becomes more semiconducting and presents a maximum in the isotherms of S for x = 0.65. For the excess tellurium concentration range we have calculated the difference EF - EV and γ/kB, assuming a S(1/T) law. The experimental values are compared with those of Dancy and Glazov.

The Electrical Resistivity, Thermal Conductivity, and Thermoelectric Power of Calcium from 30 K to 300 K

1975 ◽  
Vol 53 (5) ◽  
pp. 486-497 ◽  
Author(s):  
J. G. Cook ◽  
M. J. Laubitz ◽  
M. P. Van der Meer
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Band Structure ◽  
Large Deviations ◽  
Transport Properties ◽  
Thermoelectric Power ◽  
Band Model ◽  
Residual Resistance ◽  
Two Samples ◽  
Two Band Model

Data are presented for the thermal and electrical resistivity and thermoelectric power of two samples of Ca (having residual resistance ratios of 10 and 70) between 30 and 300 K. Large deviations from both Matthiessen's rule and the Wiedemann–Franz relationship are observed. The former are tentatively attributed to the presence of two distinct groups of carriers in Ca, and analyzed using the two band model. The latter deviations are interpreted as the effects of band structure. The thermoelectric power of Ca is large. In many respects the transport properties of Ca appear to be similar to those of the transition metals.

scholarly journals Fluctuation conductivity in two-band superconductor SmFeAsO0.8F0.2

2015 ◽  
Vol 33 (3) ◽  
pp. 644-648 ◽  
Author(s):  
I.N. Askerzade ◽  
R. T. Tagiyeva Askerbeyli
Keyword(s):  
Magnetic Field ◽  
Landau Theory ◽  
Three Dimensional ◽  
Band Model ◽  
Ginzburg Landau ◽  
Band Theory ◽  
Fluctuation Conductivity ◽  
Temperature Dependences ◽  
Two Band Model ◽  
Good Agreement

Abstract In this study we have calculated the fluctuation conductivity near critical temperature of SmFeAsO0.8F0.2 superconductor using two-band Ginzburg-Landau theory. It was illustrated that in the absence of external magnetic field, the two-band model reduced to a single effective band theory with modified temperature dependences. The calculations revealed three-dimensional character of fluctuations of conductivity in the new Fe-based superconductor SmFeAsO0.8F0.2. It has been shown that such a model is in good agreement with experimental data for this compound.

scholarly journals Magnetic field dependence of triplet-singlet relaxation in quantum dots with spin-orbit coupling

2007 ◽  
Vol 75 (8) ◽  
Author(s):  
Juan I. Climente ◽  
Andrea Bertoni ◽  
Guido Goldoni ◽  
Massimo Rontani ◽  
Elisa Molinari
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit
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