Journal of Material Sciences & Engineering

Sahoo M

Publications

• Research Article
  Effect of Ferromagnetic Induced Inhomogeneity in Excess Conductivity of YBa₂Cu₃O_7-d+x CoFe₂O₄ Composite
  Author(s): Sahoo M and Behera DSahoo M and Behera D
  
  Dimensional fluctuations of superconducting order parameters in YBa2Cu3O7- δ+ x CoFe2O4 (x = 0.0, 0.1, 0.2, and 0.3 wt%) has been analyzed. SEM micro-graphs reveal the reduced grain size with the incorporation of ferromagnetic CoFe2O4 particles in the YBCO matrix. With the increase of CoFe2O4 wt% it is found that the superconducting transition temperatures (Tc) determined from standard four-probe method decreases and dropped sharply with higher wt.% addition of CoFe2O4. Excess conductivity fluctuation analysis using Aslamazov-Larkin (AL) model fitting reveals transition of two dominant regions (2D and 3D) above Tc. 2D to 3D crossover temperature i.e. Lawerence-Doniach temperature (TLD) that demarcates dimensional nature of fluctuation inside the grains is influenced by CoFe2O4 incorporation in YBCO matrix. The decrease in TLD in the mean field region has been observed as a conse.. Read More»
  DOI: 10.4172/2169-0022.1000115

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