Flux pinning and vortex dynamics in MgB2 doped with TiO2 and SiC inclusions

Prokhorov, V. G.; Kaminsky, G. G.; Svetchnikov, V. L.; Park, J. S.; Eom, T. W.; Lee, Y. P.; Kang, J.-H.; Хохлов, В. А.; Mikheenko, P.

doi:10.1063/1.3151990

Cited by 4 publications

(4 citation statements)

References 46 publications

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“…However, if this scaling seems to work for some low temperature superconductors, its validity for the new classes of superconductors is unclear and the attempts to fit f p ( h ) data using the exponents given in the Table 1 were not always successful 2 . Many puzzling results on this topic are reported for superconducting MgB 2 , single crystals, ceramics, and tapes 3 – 10 . An analysis of the limitations of this model was presented in the Ref.…”

Section: Introductionmentioning

confidence: 99%

On the pinning force in high density MgB2 samples

Sandu

Ionescu

Aldica

et al. 2021

Sci Rep

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An analysis of the field dependence of the pinning force in different, high density sintered samples of MgB2 is presented. The samples were chosen to be representative for pure MgB2, MgB2 with additives, and partially oriented massive samples. In some cases, the curves of pinning force versus magnetic field of the selected samples present peculiar profiles and application of the typical scaling procedures fails. Based on the percolation model, we show that most features of the field dependence of the critical force that generate dissipation comply with the Dew-Hughes scaling law predictions within the grain boundary pinning mechanism if a connecting factor related to the superconducting connection of the grains is used. The field dependence of the connecting function, which is dependent on the superconducting anisotropy, is the main factor that controls the boundary between dissipative and non-dissipative current transport in high magnetic field. Experimental data indicate that the connecting function is also dependent on the particular properties (e.g., the presence of slightly non-stoichiometric phases, defects, homogeneity, and others) of each sample and it has the form of a single or double peaked function in all investigated samples.

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Section: Introductionmentioning

confidence: 99%

On the pinning force in high density MgB2 samples

Sandu

Ionescu

Aldica

et al. 2021

Sci Rep

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“…The PME was observed up to now on a large variety of metallic superconductors including Nb (bulk disks, bars, thin films, as well as nanostructured samples), Pb (on bulk disks, but also in nanowire arrays and Pb-porous glass nanocomposites), mesoscopic structures of Al and Nb [62], Ta, 2H-NbSe 2 single crystals, Nb-AlO x -Nb tunnel junctions, SrBi 3 and ZrB 12 single crystals with specific vortex-vortex interaction, indium-tin oxide films with electrochemical doping (e.g., Mg), Ca 3 Rh 4 Sn 13 , Ti-V alloys, Nb-Gd composite thin films, Bi 2 Te 3 -FeTe heterostructure, Mo 100−x Re x alloy, Dy 1−x Y x Rh 4 B 4 , Co/Nb multilayers, Ag/Nb proximity structures, and also the MgB 2 system [69][70][71][72][73][74], which represents the metallic superconductor with the highest transition temperature. Here, we must note that the PME in MgB 2 was always observed in polycrystalline samples (bulks or tapes), where the grain connectivity may be different depending on the chosen preparation route.…”

Section: Metallic Superconducting Samples With Pmementioning

confidence: 99%

“…Multilayered materials may be composed of superconductor/normal metal, but also superconducting/para-or ferromagnetic ones. Of course, since the discovery of MgB 2 -the metallic superconductor with the highest transition temperature [67,68]-it was only a matter of time before reports of PME in this system appeared in the literature as well [69][70][71][72][73][74].…”

Section: Introductionmentioning

confidence: 99%

The Paramagnetic Meissner Effect (PME) in Metallic Superconductors

Koblischka

Půst

Chang

et al. 2023

Metals

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The experimental data in the literature concerning the Paramagnetic Meissner Effect (PME) or also called Wohlleben effect are reviewed with the emphasis on the PME exhibited by metallic, s-wave superconductors. The PME was observed in field-cool cooling (FC-C) and field-cool warming (FC-W) m(T)-measurements on Al, Nb, Pb, Ta, in compounds such as, e.g., NbSe2, In-Sn, ZrB12, and others, and also in MgB2, the metallic superconductor with the highest transition temperature. Furthermore, samples with different shapes such as crystals, polycrystals, thin films, bi- and multilayers, nanocomposites, nanowires, mesoscopic objects, and porous materials exhibited the PME. The characteristic features of the PME, found mainly in Nb disks, such as the characteristic temperatures T1 and Tp and the apparative details of the various magnetic measurement techniques applied to observe the PME, are discussed. We also show that PME can be observed with the magnetic field applied parallel and perpendicular to the sample surface, that PME can be removed by abrading the sample surface, and that PME can be introduced or enhanced by irradiation processes. The PME can be observed as well in magnetization loops (MHLs, m(H)) in a narrow temperature window Tp<Tc, which enables the construction of a phase diagram for a superconducting sample exhibiting the PME. We found that the Nb disks still exhibit the PME after more than 20 years, and we present the efforts of magnetic imaging techniques (scanning SQUID microscopy, magneto-optics, diamond nitrogen-vacancy (NV)-center magnetometry, and low-energy muon spin spectroscopy, (LE-μSR)). Various attempts to explain PME behavior are discussed in detail. In particular, magnetic measurements of mesoscopic Al disks brought out important details employing the models of a giant vortex state and flux compression. Thus, we consider these approaches and demagnetization effects as the base to understand the formation of the paramagnetic signals in most of the materials investigated. New developments and novel directions for further experimental and theoretical analysis are also outlined.

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“…In our previous work, we studied the flux-pinning mechanism of grain boundaries in MgB 2 + 2 at.% TiO 2 and MgB 2 + 8 at.% SiC in terms of superconducting properties [8]. However, the behavior of the grain boundaries in MgB 2 superconductor has remained unclear.…”

Section: Introductionmentioning

confidence: 99%

TiO₂Nano-doping Effect on Flux Pinning and Critical Current Density in an MgB₂Superconductor

Kang¹,

Park²,

Lee³

et al. 2011

Journal of Magnetics

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We have studied the TiO 2 doping effects on the flux pinning behavior of an MgB 2 superconductor synthesized by the in-situ solid-state reaction. From the field-cooled and zero-field-cooled temperature dependences of magnetization, the reversible-irreversible transition of TiO 2 -doped MgB 2 was determined in the H-T diagram (the temperature dependence of upper critical magnetic field and irreversibility line). For comparison, the similar measurements are also obtained from SiC-doped MgB 2 . The critical current density was estimated from the width of hysteresis loops in the framework of Bean's model at different temperatures. The obtained results manifest that nano-scale TiO 2 inclusions served as effective pinning centers and lead to the enhanced upper critical field and critical current density. It was concluded that the grain boundary pinning mechanism was realized in a TiO 2 -doped MgB 2 superconductor.

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Flux pinning and vortex dynamics in MgB2 doped with TiO2 and SiC inclusions

Cited by 4 publications

References 46 publications

On the pinning force in high density MgB2 samples

On the pinning force in high density MgB2 samples

The Paramagnetic Meissner Effect (PME) in Metallic Superconductors

TiO₂Nano-doping Effect on Flux Pinning and Critical Current Density in an MgB₂Superconductor

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Flux pinning and vortex dynamics in MgB2 doped with TiO2 and SiC inclusions

Cited by 4 publications

References 46 publications

On the pinning force in high density MgB2 samples

On the pinning force in high density MgB2 samples

The Paramagnetic Meissner Effect (PME) in Metallic Superconductors

TiO2Nano-doping Effect on Flux Pinning and Critical Current Density in an MgB2Superconductor

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TiO₂Nano-doping Effect on Flux Pinning and Critical Current Density in an MgB₂Superconductor