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- W4220935587 abstract "This comprehensive study delves into the effect of partial Y 3+ substitution for Ca 2+ in Bi 2 Sr 2 CaCu 2 O 8+y superconducting rods prepared by the laser floating zone method (LFZ). The critical transition temperatures ( T c onset , T c , T c offset ), activation energy ( U ), irreversibility field ( H irr ), upper critical magnetic field ( H c2 ), coherence length ( ξ ), and penetration depth ( λ ) are determined by means of magneto-resistivity measurements performed between 0 and 5 T. According to the resistivity-temperature graph for zero fields, T c offset values tend to decrease regularly from 90.8 K to 87.1 K, and the residual resistivity values increase steadily from 0.14 to 9.7 mΩ .cm with the Y-content. The change of these two parameters is a sign that Y-introduction into the Bi-2212 matrix undermines the inter-grain coupling and increases the level of permanent-defects in the crystalline structure. However, the relatively high T c offset values and extremely low residual resistivity, especially in the pure and low Y-substituted samples, reflect the success of the LFZ process in growing homogeneous and well-oriented Bi-2212 grains. The resistivity transition broadening is observed when the applied field increases and T c offset values decrease dramatically, i.e. from 90.8 K to 72.1 K for the pure sample and from 87.1 K to 48.2 K for the 0.20Y-substituted ones. The calculated U values using the TAFF model decrease with the increase of the Y-content and the magnetic field. In addition, the magnetic field and temperature dependence of U is expressed by using U ( H,T ) ∼ Δ T H −η equation. Deduced parameters of H irr and H c2 from magneto-resistivity curves and theoretical findings of ξ and λ also favor the degradation of U values with the augmentation of Y-content in the Bi-2212 rods. • Well-textured Y-substituted Bi-2212 rods are successfully produced using LFZ method. • The applied magnetic field up to 5T mostly affects intergranular regions rather than intra-grain ones. • The magnetic field and temperature dependence of U(H,T) is found to be U(H,T)∼ΔT H −η where η = β + n." @default.
- W4220935587 created "2022-04-03" @default.
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- W4220935587 date "2022-04-01" @default.
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- W4220935587 title "Role of Y substitution for Ca-site on magneto-resistivity properties of Bi-2212 superconductor rods prepared by LFZ" @default.
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- W4220935587 doi "https://doi.org/10.1016/j.matchemphys.2022.125995" @default.
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