scholarly journals Anisotropy of the magnetoresistance hysteresis in the granular superconductor Y-Ba-Cu-O at different magnetic-field and transport-current orientations

2017 ◽  
Vol 122 (12) ◽  
pp. 123902 ◽  
Author(s):  
D. A. Balaev ◽  
S. V. Semenov ◽  
M. A. Pochekutov
Keyword(s):  
Magnetic Field ◽  
Transport Current ◽  
Granular Superconductor

Influence of magnetic field on transport current path in BiPbSrCaCuO granular superconductor

1991 ◽  
Vol 174 (4-6) ◽  
pp. 335-339 ◽  
Author(s):  
Norimitsu Murayama ◽  
Yasuhara Kodama ◽  
Shuji Sakaguchi ◽  
Fumihiro Wakai ◽  
Yasuyoshi Torii
Keyword(s):  
Magnetic Field ◽  
Transport Current ◽  
Current Path ◽  
Granular Superconductor

scholarly journals Measurements and Analysis of AC Losses in HTS Windings of Electrical Machine for Different Operation Modes

2021 ◽  
Vol 11 (6) ◽  
pp. 2741
Author(s):  
Sergey Zanegin ◽  
Nikolay Ivanov ◽  
Vasily Zubko ◽  
Konstantin Kovalev ◽  
Ivan Shishov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
High Temperature Superconductor ◽  
High Temperature Superconductors ◽  
Transport Current ◽  
Operating Conditions ◽  
Ac Losses ◽  
Electrical Machine ◽  
2Nd Generation ◽  
Motor Mode

The article is devoted to the study of losses in devices based on high-temperature superconductors of the 2nd generation. The complexity of the devices under study increases from a single rack coil to a winding assembled from several coils, and finally to an electric machine operating in generator mode. This is the way to experimentally study the behavior of 2nd generation high temperature superconductor (2G HTS) carrying a transport current in various conditions: self-field, external DC, and AC magnetic field. Attention is also paid to the losses in the winding during its operation from the inverter, which simulates the operating conditions in the motor mode of a propulsion system.

AC losses of Ag-(Bi,Pb)SrCaCuO-2223 tapes in combination of transverse external magnetic field and transport current

1995 ◽  
Vol 5 (2) ◽  
pp. 709-712 ◽  
Author(s):  
M. Ciszek ◽  
B.A. Glowacki ◽  
S.P. Ashworth ◽  
A.M. Campbell ◽  
J.E. Evetts
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Transport Current ◽  
Ac Losses

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.

scholarly journals Magnetic Imaging of Superconducting Tapes to Determine Current Flow

2000 ◽  
Vol 659 ◽  
Author(s):  
G.W. Brown ◽  
M.E. Hawley ◽  
S.R. Foltyn ◽  
F.M. Mueller
Keyword(s):  
Magnetic Field ◽  
Current Flow ◽  
Imaging System ◽  
Ion Beam ◽  
Hard Disk Drives ◽  
Liquid Nitrogen Temperature ◽  
Transport Current ◽  
Superconducting Tapes ◽  
Magnetic Imaging ◽  
Density Maps

ABSTRACTWe have developed a magnetic imaging system that uses magnetoresistive read heads from computer hard disk drives to map the transport-current-induced magnetic field at the surface of superconducting tapes at liquid nitrogen temperature. Transport current pathways are determined from the 2-dimensional magnetic field maps using established inversion schemes. We examined the current flow in pulsed-laser-deposited YBa2Cu3O7-σ films patterned on single crystal SrTiO3 substrates and on a textured yttria-stabilized-zirconia layer deposited on an Inconel ribbon by ion beam assisted deposition. The transport current densities in all cases were consistent with the Critical State Model. For the Inconel-based sample, the transport current density maps have allowed us to observe defects and determine the region that limits the current carrying capacity of the structure.

Measuring transport current loss of BSCCO/Ag tapes exposed to external AC magnetic field

1998 ◽  
Vol 310 (1-4) ◽  
pp. 101-105 ◽  
Author(s):  
J.J. Rabbers ◽  
B. ten Haken ◽  
H.H.J. ten Kate
Keyword(s):  
Magnetic Field ◽  
Transport Current ◽  
Current Loss ◽  
Ac Magnetic Field

TRANSPORT CURRENT CHARACTERISTICS OF THE TEXTURED Bi-2223 THICK FILM

1995 ◽  
Vol 09 (21) ◽  
pp. 1369-1376 ◽  
Author(s):  
Z. H. WANG
Keyword(s):  
Magnetic Field ◽  
Thick Film ◽  
Power Law ◽  
Flow Behavior ◽  
Transport Current ◽  
Transport Critical Current Density ◽  
Flux Flow ◽  
Different Temperatures ◽  
Current Characteristics ◽  
Activated Flux

The transport current characteristics of the textured Bi-2223 thick film were studied by the measurement of the voltage–current curves for different temperatures and various magnetic fields. The results show that the transitions can be fitted approximately by a power law with n-values at the low electrical field region. The n-value is observed to fall with increased applied magnetic field and temperature, and exhibits the thermally activated flux flow behavior. The activation energies U(T, H, J) derived from the V-I curves were found to follow a (n − 1)k B T × ln (J0/J). The critical temperature T c was found to follow the irreversibility line described by the function of H ∝ (1− T CH /T CO )1.47 for H//ab-plane. The temperature and magnetic field dependences of the transport critical current density follow a power law J c ~ (1−T COH /T COO )m and J c ~ H−α for H//ab-plane. The exponent m increases with increasing magnetic field, and α decreases with decreasing temperature. These indicate that the flux motion may be caused by a weak pinning potential energy.

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