Effect of current-loop sizes on the para-Meissner effect in superconductors

Krishna, N.M.; Lingam, Lydia S.; Ghosh, Parag; Shrivastava, Keshav N.

doi:10.1016/s0921-4534(97)01738-3

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…The vertical axis shows the complete diamagnetism change of the material, and the Meissner effect of all samples can be observed through the DC magnetization data. With the increase of temperature, complete diamagnetism, or the Meissner effect weakens and eventually disappears, which is consistent with literature [ 62 , 63 , 64 ]. The Meissner effect of pure MgB 2 samples disappeared at 37.4 K, and that of the 0.5 wt.% inhomogeneous phase MgB 2 samples disappeared at 36.8 K. The Meissner effect of 0.9 wt.%, 1.0 wt.% and 1.2 wt.% MgB 2 samples disappeared when the temperature was higher than 37.6 K, 37.8 K and 38 K, respectively.…”

Section: Resultssupporting

confidence: 92%

An Improved Smart Meta-Superconductor MgB2

Zhao¹,

Hai²,

Miao³

et al. 2022

Nanomaterials

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Increasing and improving the critical transition temperature (TC), current density (JC) and the Meissner effect (HC) of conventional superconductors are the most important problems in superconductivity research, but progress has been slow for many years. In this study, by introducing the p-n junction nanostructured electroluminescent inhomogeneous phase with a red wavelength to realize energy injection, we found the improved property of smart meta-superconductors MgB2, the critical transition temperature TC increases by 0.8 K, the current density JC increases by 37%, and the diamagnetism of the Meissner effect HC also significantly improved, compared with pure MgB2. Compared with the previous yttrium oxide inhomogeneous phase, the p-n junction has a higher luminescence intensity, a longer stable life and simpler external field requirements. The coupling between superconducting electrons and surface plasmon polaritons may be explained by this phenomenon. The realization of smart meta-superconductor by the electroluminescent inhomogeneous phase provides a new way to improve the performance of superconductors.

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Section: Resultssupporting

confidence: 92%

An Improved Smart Meta-Superconductor MgB2

Zhao¹,

Hai²,

Miao³

et al. 2022

Nanomaterials

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“…Figure 5 shows the DC magnetization data of pure B(P)SCCO (C1) and B(P)SCCO doped with 0.3 wt% Y 2 O 3 (C3), Y 2 O 3 :Eu 3+ (C4), and Y 2 O 3 :Eu 3+ +Ag (C5). Meissner effect is observed in all Bi(Pb)SrCaCuO samples by DC magnetization data, and the Meissner effect weakens and eventually disappears with the increase in temperature, which is consistent with the results of references [ 57 , 58 , 59 ]. The Meissner effect of pure B(P)SCCO disappears when the temperature is higher than 100 K, and that of B(P)SCCO doped with non-luminescent dopant Y 2 O 3 disappears when the temperature is higher than 97 K. Meanwhile, the Meissner effect of Y 2 O 3 :Eu 3+ and Y 2 O 3 :Eu 3+ +Ag luminescent inhomogeneous phase-doped samples disappears when the temperature is higher than 102 and 104 K, respectively.…”

Section: Resultssupporting

confidence: 92%

Critical Current Density and Meissner Effect of Smart Meta-Superconductor MgB2 and Bi(Pb)SrCaCuO

Chen¹,

Li²,

Qi³

et al. 2022

Materials

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The smart meta-superconductor MgB2 and Bi(Pb)SrCaCuO increase the superconducting transition temperature (TC), but the changes in the transport critical current density (JC) and Meissner effect are still unknown. Here, we investigated the JC and Meissner effect of smart meta-superconductor MgB2 and Bi(Pb)SrCaCuO. The use of the standard four-probe method shows that Y2O3:Eu3+ and Y2O3:Eu3++Ag inhomogeneous phase significantly increase the JC, and JC decreases to a minimum value at a higher temperature. The Meissner effect was measured by direct current magnetization. The doping of Y2O3:Eu3+ and Y2O3:Eu3++Ag luminescent inhomogeneous phase causes a Meissner effect of MgB2 and Bi(Pb)SrCaCuO at a higher temperature, while the non-luminescent dopant reduces the temperature at which samples have Meissner effect. The introduction of luminescent inhomogeneous phase in conventional MgB2 and copper oxide high-temperature Bi(Pb)SrCaCuO superconductor increases the TC and JC, and Meissner effect is exerted at higher temperature. Therefore, smart meta-superconductivity is suitable for conventional and copper oxide high-temperature superconductors.

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Flux quantized magnetization of superconducting aluminium

Shrivastava

2000

Physica B: Condensed Matter

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Effect of current-loop sizes on the para-Meissner effect in superconductors

Cited by 3 publications

References 17 publications

An Improved Smart Meta-Superconductor MgB2

An Improved Smart Meta-Superconductor MgB2

Critical Current Density and Meissner Effect of Smart Meta-Superconductor MgB2 and Bi(Pb)SrCaCuO

Flux quantized magnetization of superconducting aluminium

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