Superconducting Fluctuations in Polycrystalline Y3Ba5Cu8O18

“…Hence, the study of electrical excess conductivity due to thermodynamic fluctuation is important to understand the intrinsic superconducting characteristics and can provide relevant information to resolve some microscopic and mesoscopic discrepancies in Y-358 and Y-123 compounds. Studies reporting analyses of the excess conductivity for Y-358 compounds are very scarce [16,17]. They have restricted their analyses on the discussion about the different dimensionality crossover regions and on the calculation of the coherence length or on the layer spacing of the 2D system.…”

Section: Introductionmentioning

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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“…A and B have been obtained from the resistivity slope (dR/dT) and residual resistivity R res at T = 0 K. The other region is characterized by the formation of cooper pairs above the transition temperature [32]. Resistivity deviates from linearity due to the cooper pairs at a characteristic temperature T s , which indicates the existence of excess conductivity [36].…”

Section: Resultsmentioning

confidence: 99%

Effect of MgB₂ additives on structure, electrical and thermal properties of Eu₁Ba₂Cu₃O₇

Akduran

2018

Materials Science-Poland

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The effect of MgB 2 addition on the Eu 1 Ba 2 Cu 3 O 7 (EBCO) ceramics was systematically studied. Series of Eu 1 Ba 2 Cu 3 O 7 + x(MgB 2 ) samples (x = 0 wt.%, 0.05 wt.%, 0.1 wt.%, 1 wt.%, 3 wt.%) were prepared using traditional solid state method. X-ray powder diffraction measurements were used for phase identification. The lattice parameters and orthorombicity decreased with MgB 2 addition. A standard four point measurement method was used to determine transition temperatures T c of superconducting samples. T c values of the samples were decreasing with MgB 2 concentration. TGA results indicate thermal stability of doped samples.

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Superconducting Fluctuations in Polycrystalline Y3Ba5Cu8O18

Cited by 18 publications

References 26 publications

An investigation of magnetoresistivity properties of an Y3Ba5Cu8Oy bulk superconductor

An investigation of magnetoresistivity properties of an Y3Ba5Cu8Oy bulk superconductor

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

Effect of MgB₂ additives on structure, electrical and thermal properties of Eu₁Ba₂Cu₃O₇

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Superconducting Fluctuations in Polycrystalline Y3Ba5Cu8O18

Cited by 18 publications

References 26 publications

An investigation of magnetoresistivity properties of an Y3Ba5Cu8Oy bulk superconductor

An investigation of magnetoresistivity properties of an Y3Ba5Cu8Oy bulk superconductor

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

Effect of MgB2 additives on structure, electrical and thermal properties of Eu1Ba2Cu3O7

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Effect of MgB₂ additives on structure, electrical and thermal properties of Eu₁Ba₂Cu₃O₇