Hysteresis loops of MgB2 + Co composite tapes

Altın, E.; Gokhfeld, D. M.; Комогорцев, С. В.; Altın, S.; Yakıncı, M. E.

doi:10.1007/s10854-012-0931-2

Cited by 6 publications

(5 citation statements)

References 30 publications

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“…Additional diamagnetic [5] / paramagnetic [6,7] phases in a sample tilt the magnetization hysteresis clockwise / anticlockwise. Coexistence of superconducting and ferromagnetic phases in a sample gives a composite hysteresis [8]. For hysteresis of the superconducting phase the dependence of M on H approaches to 0 as H increases to the upper critical field H c2 .…”

Section: Determination Of Superconducting Parameters From Magnetic Mementioning

confidence: 99%

Analysis of Superconductor Magnetization Hysteresis

Gokhfeld¹

2018

J. Sib. Fed. Univ., Math. phys.

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An essential criterion of superconductivity in studied samples is sharp drop of the resistance at some temperature. Other essential criterion is a great diamagnetic response during the magnetization measurements. Temperature and magnetic field dependencies of the magnetization give the detailed characterization of the superconducting phase in single-crystal and polycrystalline samples.The critical state model [1] and its many modifications describe entering and trapping of magnetic flux in a II-type superconductor. The extended critical state model [2-4] accounts contributions to the magnetization loop from the surface and the internal volume of a superconducting sample. The extended model allows to parametrize the magnetization hysteresis with asymmetry relative to the M = 0 axis.

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Section: Determination Of Superconducting Parameters From Magnetic Mementioning

confidence: 99%

Analysis of Superconductor Magnetization Hysteresis

Gokhfeld¹

2018

J. Sib. Fed. Univ., Math. phys.

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“…In formulae 3 and 4 the size R determines the circulation region of the screening current. For granular superconductors, there is an ambiguity in choosing the scale of R [9,16]: It can be chosen as the radius of the sample or as the average effective radius of the grains. The screening current can also circulate in clusters consisting of several grains.…”

Section: Full Penetration Fieldmentioning

confidence: 99%

“…For heterogeneous samples the porosity must be also accounted for estimating of j c [2,7]. For the granular superconductors analyzed earlier [2,7,[9][10][11]13], the effective radius satisfying the fitting is about the averaged grain size in the ab plane determined from scanning electron microscopy images.…”

Section: Scale Of Screening Currentmentioning

confidence: 99%

“…ECSM combined with the computation of the field distribution into the sample [2][3][4] gives new facilities for analysis of magnetic characteristics of bulk superconductors. This model is applicable to describe magnetization loops of different superconducting materials [2,[7][8][9][10][11][12][13]. Estimations with using ECSM are useful for constructing of promising application devises (trapped field magnets, magnetic shielding, levitation etc.…”

Section: Introductionmentioning

confidence: 99%

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Critical current density and trapped field in HTS with asymmetric magnetization loops

Gokhfeld

2016

J. Phys.: Conf. Ser.

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Applications of the extended critical state model are considered. The trapped magnetic field, the penetration field and the field dependence of the critical current density are analysed. The critical current density and the trapped field in superconducting grains depend on the grain size. Asymmetry of the hysteresis curves relative to the M = 0 axis is related to the scale of the current circulation.

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“…The creation of pinning centers in high-temperature superconductors (HTSCs) as well as their thermal and chemical stability has been described in the literature in detail [1][2][3][4]. The most well-known methods for creating structural defects turn out to be the radiation exposure [1], the introduction of various cations into the crystal lattice [2,3], and the introduction of nonsuperconducting particles into the superconductor [1,4]. These methods have two disadvantages: firstly, radiation defects are nondurable; secondly, foreign impurities inside the superconductor often reduce the critical temperature.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties and Critical Current of Superconducting Nanocomposites (1 −x)YBa2Cu3O7−δ + xCuO

Лепешев

Patrin

Yurkin

et al. 2018

J Supercond Nov Magn

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The aim of this paper was to study the effect of nanoscale inclusions of CuO as the second ingredient of composites on transport properties of superconducting YBa 2 Cu 3 O 7 polycrystals. The samples of YBa 2 Cu 3 O 7−δ with different content of CuO nanoparticles were synthesized. The analysis of the magnetic properties was carried out within the extended critical state model. It was found that the addition of 0.5 and 1% of CuO nanoparticles leads to an increase in the intragranular density of the critical current at T = 4.2 K. A further increase of x from 2 to 15% and more than 40% decreases the critical current density. The critical current density higher than in the reference sample was also found in the samples with x = 20% and x = 24%.

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Hysteresis loops of MgB2 + Co composite tapes

Cited by 6 publications

References 30 publications

Analysis of Superconductor Magnetization Hysteresis

Analysis of Superconductor Magnetization Hysteresis

Critical current density and trapped field in HTS with asymmetric magnetization loops

Magnetic Properties and Critical Current of Superconducting Nanocomposites (1 −x)YBa2Cu3O7−δ + xCuO

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