Intergranular percolation in granular YBCO/BaTiO3 composites |
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Authors: | Annapurna Mohanta Dhrubananda Behera Simanchalo Panigrahi and Naresh Chandra Mishra |
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Institution: | (1) Department of Physics, National Institute of Technology, Rourkela, 769 008, Orissa, India;(2) Department of Physics, Utkal University, Bhubaneswar, 751 004, Orissa, India |
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Abstract: | Ferroelectrics and high temperature superconductors are two promising materials for future electronic devices. Both being
perovskite ceramic structures with similar crystal chemistry a set of samples were prepared from the composite of (1−x)YBa2Cu307−δ
−(x)BaTiO3 (YBCO/BT). These samples were investigated with temperature dependent resistance, FTIR, X-ray diffraction and SEM-EDX analysis.
It has been found that the critical exponent in the T
c0 (R = 0) region is in agreement with the percolation theory. A long-range superconducting order results from thermally assisted
percolation process through weak-links between the grains. The connectivity in the coherent transition region can be explained
by a power law.
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Keywords: | Composite superconductivity percolation |
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