Transport Properties of Superconductors in the Mixed State

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3102-3105 ◽  
Author(s):  
Jan Koláček ◽  
Petr Vašek
Keyword(s):  
Magnetic Field ◽  
Magnetic Field Dependence ◽  
Equations Of Motion ◽  
Charge Carriers ◽  
Hall Voltage ◽  
Sign Reversal ◽  
New Formula ◽  
The Magnetic Field ◽  
Properties Of Superconductors ◽  
State Charge

The Hall voltage sign reversal is consistently explained by the model in which vortices with the superconducting and normal state charge carriers are regarded as three independent subsystems mutually connected by interactions. The equations of motion for these three subsystems are solved simultaneously and a new formula for the Hall resistivity is obtained. It is shown that by this model it is possible to explain qualitatively experimental data. Despite of the fact that the pinning forces have not been taken into account the formula qualitatively explains not only the double Hall voltage sign reversal observed in Bi and Tl based superconductors below the critical temperature but also the magnetic field dependence of the Hall conductivity.

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.

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

Mechanism of the magnetic field dependence for the liquid phase photoreaction in the nanotube of MCM-41

2002 ◽  
Vol 4 (7) ◽  
pp. 1201-1205 ◽  
Author(s):  
Masaharu Okazaki ◽  
Kazumi Toriyama ◽  
Kiichi Oda ◽  
Toshio Kasai
Keyword(s):  
Magnetic Field ◽  
Liquid Phase ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
The Magnetic Field ◽  
Mcm 41
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