NDLI: Excess Conductivity Studies in Zn$_{0.95}$Mn$_{0.05}$O and ZnO Added YBa$_{2}$Cu$_{3}$O$

Content Provider	Springer Nature Link
Author	Bouchoucha, I. Ben Azzouz, F. Ben Salem, M.
Copyright Year	2010
Abstract	We report electrical conductivity fluctuation analyses on YBa$_{2}$Cu$_{3}$O$_{y}$ (denoted as YBCO) granular samples added with nanosize ZnMnO (ZnMnO for brevity) and ZnO (30 nm) particles. Nanoparticles are added to the precursor powders during the final sintering cycle of a two-step preparation process. Phase analysis by X-ray diffraction and granular structure examination by transmission electron microscopy (TEM) were carried out. When ZnMnO and ZnO are added to the YBCO, the orthorhombic structure is maintained. TEM and energy dispersive X-ray spectroscopy analysis show the presence of inhomogeneities embedded in the superconducting matrix. The temperature dependence of electrical resistivity in zero magnetic field has been measured on free, 1 wt.% ZnMnO and 1 wt.% ZnO added samples and the effect of microscopic inhomogeneities in the paraconductivity region has been reported. Data about the dimensionality of the thermodynamic fluctuation are obtained by analyzing the excess of conductivity Δσ as a function of the reduced temperature $\varepsilon =\ln(\frac{T}{T_{c}^{mf}}-1)$ on the basis of the Aslamazov–Larkin theory. In the mean-field region a crossover from 3D to 2D was observed for each sample. 1D behavior of fluctuation conductivity was found at high temperatures (above the 2D regime) for nanoparticle added samples. The zero-temperature coherence length, the effective layer thickness of the two-dimensional system, the wire cross-sectional area for one-dimensional system, critical magnetic fields and critical current density are estimated. Superconducting parameters are affected by the nanoparticle additions.
Starting Page	345
Ending Page	350
Page Count	6
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	24
Issue Number	1-2
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2010-10-08
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	YBCO superconductor Excess conductivity Nanometer (Zn,Mn)O addition Critical parameters Characterization and Evaluation of Materials Magnetism, Magnetic Materials Strongly Correlated Systems, Superconductivity Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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