Role of Temperature on Flux Trap Behavior in &lt; 100 &gt; Pb Cylindrical Sample: Polarized Neutron Radiography Investigation

Dhiman, Indu; Ebrahimi, O.; Karakas, N.; Höppner, Henning; Ziesche, R.; Treimer, W.

doi:10.1016/j.phpro.2015.07.059

Cited by 4 publications

(5 citation statements)

References 22 publications

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“…This e↵ect is further enhanced due to di↵erent neutron path length through the cylindrical shaped sample. This behavior is in corroboration with our previously reported studies on type-I Pb superconductor 76,77 . This distribution can only occur for a magnetic field which appears to be squeezed around the rod axis, i.e.…”

Section: Methodssupporting

confidence: 93%

“…While, neutrons can easily penetrate bulk samples and due to their magnetic moment can interact with the local magnetic field distributions. Recently, this technique has been recognized as a powerful nondestructive tool to visualize the magnetic field distribution in various ferromagnetic samples and pinned flux in superconductors [72][73][74][75][76][77] . From a macroscopic viewpoint, the superconducting state is a thermodynamic phase.…”

mentioning

confidence: 99%

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Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La2−xSrxCuO4 ( x=
Dhiman
¹
,
Ziesche
²
,
Anand
³

et al. 2017
Phys. Rev. B
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We have studied the evolution of magnetic flux pinning behavior in the Meissner phase and the mixed state for the high-Tc single crystal La2xSrxCuO4 (x = 0.09) superconductor using the polarized neutron imaging method with varying magnetic field and temperature. In the Meissner state expulsion of magnetic field (switched on during the measurements) is visualized, and the signatures of mixed state with increasing temperature are observed. While, for flux pinning behavior between 5 K  T  15 K and Hext = 63.5 mT (switched o↵ during the measurements), the evolution of fringe pattern indicates magnetic flux pinning inside the bulk of the sample. At 25 K  T  32 K, a continuous decrease of inhomogeneously distribution pinned magnetic flux is observed, with the sample reaching a normal conducting state at Tc (⇡ 32 K). The flux pinning behavior is also explored as a function of Hext, at T = 5 K. As expected, with increasing Hext an increase in fringe density is observed, indicating an increase in magnetic flux pinning in the bulk of the sample. Comparison between calculated and experimentally visualized pinned magnetic flux shows good agreement. This implies quantification of pinned magnetic flux inside the sample, which is not possible with any other technique on bulk samples.

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Section: Methodssupporting

confidence: 93%

mentioning

confidence: 99%

Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La2−xSrxCuO4 ( x=
Dhiman
¹
,
Ziesche
²
,
Anand
³

et al. 2017
Phys. Rev. B
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“…The entry of magnetic flux to sulfur occurs already at 0HM = 30 mT, the lowest value of an applied magnetic field in the experiment. This indicates that metallic sulfur belongs either to type-II superconductors or dirty type-I superconductors 35,36 . To exclude the contribution of sulfur to the measured magnetic response, only a portion of mtrap(T) data collected above 30 K was used to interpret the temperature-dependence of the trapped flux in H3S.…”

Section: Resultsmentioning

confidence: 99%

Magnetic field screening in hydrogen-rich high-temperature superconductors

et al. 2022

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In the last few years, the superconducting transition temperature, Tc, of hydrogen-rich compounds has increased dramatically, and is now approaching room temperature. However, the pressures at which these materials are stable exceed one million atmospheres and limit the number of available experimental studies. Superconductivity in hydrides has been primarily explored by electrical transport measurements, whereas magnetic properties, one of the most important characteristic of a superconductor, have not been satisfactory defined. Here, we develop SQUID magnetometry under extreme high-pressure conditions and report characteristic superconducting parameters for Im-3m-H3S and Fm-3m-LaH10—the representative members of two families of high-temperature superconducting hydrides. We determine a lower critical field Hc1 of ∼0.82 T and ∼0.55 T, and a London penetration depth λL of ∼20 nm and ∼30 nm in H3S and LaH10, respectively. The small values of λL indicate a high superfluid density in both hydrides. These compounds have the values of the Ginzburg-Landau parameter κ ∼12–20 and belong to the group of “moderate” type II superconductors, rather than being hard superconductors as would be intuitively expected from their high Tcs.

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“…The entry of magnetic flux into sulfur occurred at μ 0 H M = 30.0 mT in the ZFC mode and 0.5 mT in the FC mode, which were the lowest applied magnetic fields in the two runs. This indicated that metallic sulfur belonged to either type-II or dirty type-I superconductors 37,38 . To exclude the contribution of sulfur to the measured magnetic response, only a portion of the m trap (T) data collected above 30 K was used to interpret the temperature dependence of the trapped flux in H 3 S.…”

Section: Articlementioning

confidence: 99%

Magnetic flux trapping in hydrogen-rich high-temperature superconductors

et al. 2023

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Recent discoveries of superconductivity in various hydrides at high pressures have shown that a critical temperature of superconductivity can reach near-room-temperature values. However, experimental studies are limited by high-pressure conditions, and electrical transport measurements have been the primary technique for detecting superconductivity in hydrides. Here we implement a non-conventional protocol for the magnetic measurements of superconductors in a SQUID magnetometer and probe the trapped magnetic flux in two near-room-temperature superconductors H3S and LaH10 at high pressures. Contrary to traditional magnetic susceptibility measurements, the magnetic response from the trapped flux is almost unaffected by the background signal of the diamond anvil cell due to the absence of external magnetic fields. The behaviour of the trapped flux generated under zero-field-cooled and field-cooled conditions proves the existence of superconductivity in these materials. We reveal that the absence of a pronounced Meissner effect is associated with the very strong pinning of vortices inside the samples. This approach can also be a tool for studying multiphase samples or samples that have a low superconducting fraction at ambient pressure.

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Role of Temperature on Flux Trap Behavior in < 100 > Pb Cylindrical Sample: Polarized Neutron Radiography Investigation

Cited by 4 publications

References 22 publications

Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La2−xSrxCuO4 ( x=
Dhiman
¹
,
Ziesche
²
,
Anand
³

et al. 2017
Phys. Rev. B
Self Cite
8
1
4
0
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Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La2−xSrxCuO4 ( x=
Dhiman
¹
,
Ziesche
²
,
Anand
³

et al. 2017
Phys. Rev. B
Self Cite
8
1
4
0
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Magnetic field screening in hydrogen-rich high-temperature superconductors

Magnetic flux trapping in hydrogen-rich high-temperature superconductors

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Role of Temperature on Flux Trap Behavior in < 100 > Pb Cylindrical Sample: Polarized Neutron Radiography Investigation

Cited by 4 publications

References 22 publications

Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La2−xSrxCuO4 ( x=Dhiman1, Ziesche2, Anand3 et al. 2017Phys. Rev. BSelf Cite8140View full textAdd to dashboardCite

Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La2−xSrxCuO4 ( x=Dhiman1, Ziesche2, Anand3 et al. 2017Phys. Rev. BSelf Cite8140View full textAdd to dashboardCite

Magnetic field screening in hydrogen-rich high-temperature superconductors

Magnetic flux trapping in hydrogen-rich high-temperature superconductors

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Product

Resources

About

Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La2−xSrxCuO4 ( x=
Dhiman
¹
,
Ziesche
²
,
Anand
³

et al. 2017
Phys. Rev. B
Self Cite
8
1
4
0
View full text Add to dashboard Cite

Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La2−xSrxCuO4 ( x=
Dhiman
¹
,
Ziesche
²
,
Anand
³

et al. 2017
Phys. Rev. B
Self Cite
8
1
4
0
View full text Add to dashboard Cite