Temperature behavior of the magnetoresistance hysteresis in a granular high-temperature superconductor: Magnetic flux compression in the intergrain medium

2018 ◽  
Vol 550 ◽  
pp. 19-26 ◽  
Author(s):  
S.V. Semenov ◽  
D.A. Balaev
Keyword(s):  
High Temperature ◽  
Magnetic Flux ◽  
High Temperature Superconductor ◽  
Temperature Behavior ◽  
Flux Compression ◽  
Magnetic Flux Compression

scholarly journals Механизмы, определяющие гистерезис магнитосопротивления гранулярного ВТСП в присутствии парамагнитного вклада, на примере HoBa-=SUB=-2-=/SUB=-Cu-=SUB=-3-=/SUB=-O-=SUB=-7-delta-=/SUB=-

2021 ◽  
Vol 63 (10) ◽  
pp. 1462
Author(s):  
С.В. Семенов ◽  
Д.М. Гохфельд ◽  
К.Ю. Терентьев ◽  
Д.А. Балаев
Keyword(s):  
Rare Earth ◽  
Magnetic Flux ◽  
Rare Earth Elements ◽  
High Temperature Superconductor ◽  
Effective Field ◽  
Strong Concentration ◽  
Paramagnetic Contribution ◽  
Flux Compression ◽  
Magnetic Flux Compression ◽  
Magnetic Rare Earth

The hysteretic magnetoresistance of granular high-temperature superconductor (HTSC) HoBa2Cu3O7-δ is investigated. Superconductors of the YBCO family with magnetic rare earth elements (Nd, Ho, Er, Sm, Yb, Dy) in place of yttrium are characterized by a significant paramagnetic contribution to the total magnetization. Impact of this paramagnetic contribution on the magnetotransport properties is analyzed using the concept of an effective field in an intergranular medium. Lines of magnetic induction from paramagnetic moments do not concentrate in intergranular boundaries, and, thus, have an insignificant effect on magnetotransport properties of granular HTSC. At the same time, there are strong concentration of magnetic flux in the intergranular boundaries due to Meissner currents and Abrikosov vortices. This magnetic flux compression determines the magnetotransport properties of granular HTSCs, including YBCO with magnetic rare earth elements.

scholarly journals Модель поведения гранулярного ВТСП во внешнем магнитном поле: температурная эволюция гистерезиса магнитосопротивления

2020 ◽  
Vol 62 (7) ◽  
pp. 1008
Author(s):  
С.В. Семенов ◽  
Д.А. Балаев
Keyword(s):  
High Temperature ◽  
External Field ◽  
High Temperature Superconductor ◽  
Magnetic Moments ◽  
Local Maximum ◽  
Effective Field ◽  
Temperature Range ◽  
Flux Compression ◽  
Local Extrema ◽  
Extraordinary Form

Abstract A model for describing the magnetoresistance behavior in a granular high-temperature superconductor (HTS) that has been developed in the last decade explains a fairly extraordinary form of the hysteretic R ( H ) dependences at T = const and their hysteretic features, including the local maximum, the negative magnetoresistance region, and the local minimum. In the framework of this model, the effective field B _eff in the intergrain medium has been considered, which represents a superposition of the external field and the field induced by the magnetic moments of HTS grains. This field can be written in the form B _eff( H ) = H + 4πα M ( H ), where M ( H ) is the experimental field dependence of the magnetization and α is the parameter of crowding of the magnetic induction lines in the intergrain medium. Therefore, the magnetoresistance is a function of not simply an external field, but also the “internal” effective field R ( H ) = f ( B _eff( H )). The magnetoresistance of the granular YBa_2Cu_3O_7 – δ HTS has been investigated in a wide temperature range. The experimental hysteretic R ( H ) dependences obtained in the high -temperature range (77–90 K) are well explained using the developed model and the parameter α is 20–25. However, at a temperature of 4.2 K, no local extrema are observed, although the expression for B _eff( H ) predicts them and the parameter α somewhat increases (~30–35) at this temperature. An additional factor that must be taken into account in this model can be the redistribution of the microscopic current trajectories, which also affects the dissipation in the intergrain medium. At low temperatures under the strong magnetic flux compression (α ~ 30–35), the microscopic trajectories of the current I _ m can change and tunneling through the neighboring grain is preferred, but the angle between I _ m and B _eff will be noticeably smaller than 90°, although the external (and effective) field direction is perpendicular to the macroscopic current direction.

Numerical Modeling of a Magnetic Flux Compression Experiment

2006 ◽  
Vol 26 (1-2) ◽  
pp. 109-112 ◽  
Author(s):  
Volodymyr Makhin ◽  
Bruno S. Bauer ◽  
Thomas J. Awe ◽  
Stephan Fuelling ◽  
Tasha Goodrich ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Magnetic Flux ◽  
Flux Compression ◽  
Magnetic Flux Compression

EXPERIMENTS ON EXPLOSIVELY DRIVEN MAGNETIC FLUX COMPRESSION IN NATIONAL CHEMICAL LABORATORY FOR INDUSTRY

1983 ◽  
pp. 327-329
Author(s):  
Yozo Kakudate ◽  
Shuzo Fujiwara ◽  
Masao Kusakabe ◽  
Katsutoshi Aoki ◽  
Katsumi Tanaka ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
National Chemical Laboratory ◽  
Chemical Laboratory ◽  
Flux Compression ◽  
Magnetic Flux Compression
Sign in / Sign up

Export Citation Format

Share Document