Flux jump behaviors and mechanism of FeTi doped MgB2 at 5K

Lee, H.B.; Kim, G.C.; Kim, Y.C.; Ahmad, Dawood

doi:10.1016/j.physc.2015.05.002

Cited by 9 publications

(5 citation statements)

References 21 publications

(24 reference statements)

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“…(Fe, Ti) particle is amorphous, which shows different magnetic behavior from crystal Fe. We did not find any distortion in M-H curves of specimens [12]. Therefore, ∆H = ∆B region is real in the specimen as shown in Fig.…”

Section: Discussionmentioning

confidence: 48%

Temperature Dependence of a Width of $Δ$H = $Δ$B Region in 5 wt.\% (Fe, Ti) Paticle-Doped MgB$_2$ Superconductor

Lee,

Kim

2019

Preprint

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A temperature dependence of a width of ∆H = ∆B region has been studied for 5 wt.% (Fe, Ti) particle-doped MgB 2 superconductor. The result revealed that widths of the region are linear along temperature. Here we show the meaning of the result and details of the calculation. In previous report, we represented a theory that a width of ∆H = ∆B region is related with upper critical field of the superconductor, which is that pinned fluxes at volume defect are picked out and move in ∆H = ∆B region when a distance between them is the same as that of upper critical field. Thus, we inspected the relationship between a width of the region and upper critical field along temperature. The theory would gain another justification if temperature dependence of a width of the region is proportional to that of upper critical field. We discussed several topics for ∆H = ∆B region of 5 wt.% (Fe, Ti) particle-doped MgB 2 superconductor, which are Fe of (Fe, Ti) particle, Bean model, volume dependence of the region, etc..

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Section: Discussionmentioning

confidence: 48%

Temperature Dependence of a Width of $Δ$H = $Δ$B Region in 5 wt.\% (Fe, Ti) Paticle-Doped MgB$_2$ Superconductor

Lee,

Kim

2019

Preprint

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“…However, detailed mechanism and the cause have been not shown. According to our studies, one thing to note is that the optimal concentration of defects for the best performance depended on the state of pinning sites that defects produced 6 – 8 . For example, flux-pinning effects of defects in superconductor would depend on which types, what sizes, and how many.…”

Section: Introductionmentioning

confidence: 66%

Flux-pinning behaviors and mechanism according to dopant level in (Fe, Ti) particle-doped $$\text {MgB}_2$$ superconductor

Lee

Kim

Shon

et al. 2021

Sci Rep

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We have studied flux-pinning effects of $$\text {MgB}_2$$ MgB 2 superconductor by doping (Fe, Ti) particles of which radius is 163 nm on average. 5 wt.% (Fe, Ti) doped $$\text {MgB}_2$$ MgB 2 among the specimens showed the best field dependence of magnetization and 25 wt.% one did the worst at 5 K. The difference of field dependence of magnetization of the two specimens increased as temperature increased. Here we show experimental results of (Fe, Ti) particle-doped $$\text {MgB}_2$$ MgB 2 specimens according to dopant level and the causes of the behaviors. Flux-pinning effect of volume defects-doped superconductor was modeled in ideal state and relative equations were derived. During the study, we had to divide M-H curve of volume defect-dominating superconductor as three discreet regions for analyzing flux-pinning effects, which are diamagnetic increase region after $$\text {H}_{c1}$$ H c 1 , $$\Delta \text {H}=\Delta \text {B}$$ Δ H = Δ B region, and diamagnetic decrease region. As a result, flux-pinning effects of volume defects decreased as dopant level increased over the optimal dopant level, which was caused by decrease of flux-pinning limit of a volume defect. And similar behaviors are obtained as dopant level decreased below the optimal dopant level, which was caused by the decreased number of volume defects. Comparing the model with experimental results, deviations increased as dopant level increased over the optimal dopant level, whereas the two was well matched on less dopant level. The behavior is considered to be caused by the segregation of the volume defects. On the other hand, the cause that diamagnetic properties of over-doped $$\text {MgB}_2$$ MgB 2 specimens dramatically decreased as temperature increased was the double decreases of flux-pinning limit of a volume defect and the segregation effect, which are caused by over-doping and temperature increase.

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“…We have studied the flux-pinning effects of MgB 2 superconductor by doping (Fe, Ti) particles of which radius is 163 nm on average [1][2][3]. Investigating field dependences of magnetization (FDM) of the doped MgB 2 specimens, 5 wt.% doped specimen showed the best FDM and FDMs of other doped specimen became poorer as dopant level increases or decreases.…”

Section: Introductionmentioning

confidence: 99%

Flux-Pinning Effects and Mechanism of Water-Quenched 5 wt.% (Fe, Ti) Particle-Doped MgB2 Superconductor

Lee

Kim

Jeen

et al. 2020

J Supercond Nov Magn

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Flux jump behaviors and mechanism of FeTi doped MgB2 at 5K

Cited by 9 publications

References 21 publications

Temperature Dependence of a Width of $Δ$H = $Δ$B Region in 5 wt.\% (Fe, Ti) Paticle-Doped MgB$_2$ Superconductor

Temperature Dependence of a Width of $Δ$H = $Δ$B Region in 5 wt.\% (Fe, Ti) Paticle-Doped MgB$_2$ Superconductor

Flux-pinning behaviors and mechanism according to dopant level in (Fe, Ti) particle-doped $$\text {MgB}_2$$ superconductor

Flux-Pinning Effects and Mechanism of Water-Quenched 5 wt.% (Fe, Ti) Particle-Doped MgB2 Superconductor

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