Influence of oxygen ordering and sintering temperatures on the superconducting transition temperature of YBa2Cu3Ox compound at fixed oxygen content x higher than x=6.8

Kulpa, A.; Chaklader, A. C. D.; Osborne, Nora; Roemer, G.; Sullivan, Brian; Williams, Dudley

doi:10.1016/0038-1098(89)91011-9

Cited by 22 publications

(2 citation statements)

References 23 publications

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“…1). The larger c value could be responsible for a worse interlayer exchange and consequently could give poorer superconducting properties [18]. The lattice parameter variations most probably indicate that Co and Fe are incorporated into the crystal structure.…”

Section: Methodsmentioning

confidence: 99%

Excess Conductivity Study in Nano-CoFe2O4-Added YBa2Cu3O7−d and Y3Ba5Cu8O18±x Superconductors

Slimani

Hannachi

Salem

et al. 2015

J Supercond Nov Magn

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We report electrical conductivity fluctuation analyses on YBa 2 Cu 3 O 7−d (noted Y-123) and Y 3 Ba 5 Cu 8 O 18±x (noted Y-358) polycrystalline samples added with nano-sized ferrite cobalt (CoFe 2 O 4 ) particles. Phases and microstructure have been systematically investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD results reveal that the lattice parameters change for both Y-123 and Y-358 phases. SEM observations show that the grain size is reduced with increasing the content of CoFe 2 O 4 in the yttrium-based superconductor (YBCO) matrix The temperature dependence of electrical resistivity ρ(T ) has been measured and the effect of addition of magnetic CoFe 2 O 4 in the paraconductivity region has been reported. The thermodynamic fluctuation is obtained by analyzing the excess of conductivity on the basis of the Aslamazov-Larkin theory. The coherence length, the effective layer thickness, critical magnetic fields, and critical current density are estimated. Superconducting parameters are affected by the nanoparticle addition, and results are discussed in relevance to the structural and microstructure differences between Y-123 and Y-358.

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Section: Methodsmentioning

confidence: 99%

Excess Conductivity Study in Nano-CoFe2O4-Added YBa2Cu3O7−d and Y3Ba5Cu8O18±x Superconductors

Slimani

Hannachi

Salem

et al. 2015

J Supercond Nov Magn

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“…At the same time, the effect of annealing ambient conditions and manganese impurity addition level on the orthorhombic distortion (known as the oxygen ordering degree) in the covalently bonded Cu-O ribbons by using the formula of (b À a)/(b + a) (Hannachi et al, 2018). According to the equation, the size of the difference between the lengths of b-and a-axes for the YBa 2 Cu 3 O 7-y superconductors determines the orthorhombic distortion degree (Kulpa et al, 1989). One can encounter the computations for the parameters of oxygen ordering degree in Table 4 (including the data for the YBa 2-Cu 3 O 7-y Mn x superconductors produced at the oxygen annealing ambient) and the improved crystallization system, couplings between adjacent layers, and connectivity between the Mn impurity and host ions in the main matrix.…”

Section: Samplesmentioning

confidence: 99%

Support of polaronic states and charge carrier concentrations of YBa₂Cu₃O₇_‐y ceramics by oxygen and Mn₂O₃ impurity

Kurtul,

Yildirim,

Turgay

et al. 2024

Microscopy Res & Technique

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The influence of oxygen and Mn2O3 impurity addition intervals 0.01 ≤ x ≤ 0.30 on the basic electrical conductivity, stabilization, crystallinity quality, grain boundary couplings, structural, orbital hybridization mechanisms, and superconducting properties of YBa2Cu3O7‐yMnx ceramics has extensively been analyzed by electrical resistivity, X‐ray diffraction investigations, and related theoretical results. It has been found that there is a strong link between the production conditions and fundamental characteristic features. All the results deduced have enabled us to discuss the variation of electron–electron and electron–phonon interactions, order parameter for super‐electrons and cooper‐pairs, organization of Cu–O coordination, homogeneities of oxidation states, microscopic structural problems, electronic density states, and grain boundary couplings between the adjacent layers in the YBa2Cu3O7‐y ceramics. Similarly, we have discussed the change in the formation of pairing mechanisms and bipolarons in the polarizable lattices in the microdomain clusters. The results have shown that both the presence of oxygen and optimum manganese impurity of x = 0.07 led to the enhancement in the fundamental characteristic features related to the basic physical, quantum mechanical, and thermodynamics features. Thus, the material produced at the most ideal conditions has exhibited the best orthorhombic crystal structure with the distortion degree of 6.419 × 10−3, paring mechanism, and crystallinity quality due to the development of orthorhombicity and oxygen ordering degree. Namely, the addition of optimum manganese impurity has organized the Cu–O coordination and stabilized the crystal structure as much as possible. Numerically, the sample prepared with x = 0.07 Mn ions has displayed the largest crystallite size, c‐axis length, residual resistivity ratio, onset, and offset critical temperatures of 10.977, 11.723 Å, 73 nm, 98.320 K, and 100.504 K, respectively. Conversely, the same material has demonstrated the smallest oxygen ordering degree of 6.714, strain of 44.015 × 10−3, and a‐ and b‐axis lengths of 3.792 and 3.841 Å. On the other hand, the oxygen‐free annealing condition and excess manganese impurity have completely damaged the whole mechanism because of the phase transition from orthorhombic to tetragonal (structural O–T transition) crystal structure. To sum up, the oxygen and optimum manganese impurity have encouraged the YBa2Cu3O7‐y superconductors to use in much more application fields.Research Highlights The presence of oxygen and an optimal level of Mn2O3 impurity in YBa2Cu3O7‐y superconductors improved superconducting properties. The optimal level of Mn2O3 impurity promotes standard metallic characteristics. Ideal process conditions lead to the formation of super‐electrons and cooper‐pairs, expanding the superconducting energy gap. Optimal conditions lead to the expansion of orthorhombic distortion symmetry and average crystallite size. The excess manganese impurity results in a metal‐to‐insulator transition.

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Tin-oxide nanoparticles doping impact in the polycrystalline superconducting $$\mathrm{Y}_3\mathrm{Ba}_5\mathrm{Cu}_8\mathrm{O}_{18\pm \delta }$$ and $$\mathrm{Y}_1\mathrm{Ba}_2\mathrm{Cu}_3\mathrm{O}_{7-\delta }$$ composites

2021

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Influence of oxygen ordering and sintering temperatures on the superconducting transition temperature of YBa2Cu3Ox compound at fixed oxygen content x higher than x=6.8

Cited by 22 publications

References 23 publications

Excess Conductivity Study in Nano-CoFe2O4-Added YBa2Cu3O7−d and Y3Ba5Cu8O18±x Superconductors

Excess Conductivity Study in Nano-CoFe2O4-Added YBa2Cu3O7−d and Y3Ba5Cu8O18±x Superconductors

Support of polaronic states and charge carrier concentrations of YBa₂Cu₃O₇_‐y ceramics by oxygen and Mn₂O₃ impurity

Tin-oxide nanoparticles doping impact in the polycrystalline superconducting $$\mathrm{Y}_3\mathrm{Ba}_5\mathrm{Cu}_8\mathrm{O}_{18\pm \delta }$$ and $$\mathrm{Y}_1\mathrm{Ba}_2\mathrm{Cu}_3\mathrm{O}_{7-\delta }$$ composites

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Influence of oxygen ordering and sintering temperatures on the superconducting transition temperature of YBa2Cu3Ox compound at fixed oxygen content x higher than x=6.8

Cited by 22 publications

References 23 publications

Excess Conductivity Study in Nano-CoFe2O4-Added YBa2Cu3O7−d and Y3Ba5Cu8O18±x Superconductors

Excess Conductivity Study in Nano-CoFe2O4-Added YBa2Cu3O7−d and Y3Ba5Cu8O18±x Superconductors

Support of polaronic states and charge carrier concentrations of YBa2Cu3O7‐y ceramics by oxygen and Mn2O3 impurity

Tin-oxide nanoparticles doping impact in the polycrystalline superconducting $$\mathrm{Y}_3\mathrm{Ba}_5\mathrm{Cu}_8\mathrm{O}_{18\pm \delta }$$ and $$\mathrm{Y}_1\mathrm{Ba}_2\mathrm{Cu}_3\mathrm{O}_{7-\delta }$$ composites

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Support of polaronic states and charge carrier concentrations of YBa₂Cu₃O₇_‐y ceramics by oxygen and Mn₂O₃ impurity