Dear friend Yaseen Muhammad
The addition of Ag nanoparticles at the inter-grain sites in a superconductor can potentially improve Cooper pairing by enhancing the coherence length and reducing the inter-grain tunneling resistance. Cooper pairs are the fundamental entities responsible for superconductivity. They are formed due to the attractive electron-electron interaction mediated by lattice vibrations, which is described by the Bardeen-Cooper-Schrieffer (BCS) theory. In a superconductor, the Cooper pairs must have a coherence length that is larger than the interatomic spacing, and they must be able to move freely through the material without losing energy due to scattering.
When Ag nanoparticles are added at the inter-grain sites in a superconductor, they can act as pinning centers for the magnetic flux lines that are generated when a magnetic field is applied. This reduces the vortex motion and enhances the coherence length of the Cooper pairs, which results in a higher critical current density and improved superconducting properties. The presence of Ag nanoparticles also reduces the inter-grain tunneling resistance, which improves the connectivity between the grains and allows for better transfer of Cooper pairs.
Reference:
- H. Tanaka, K. Nagaosa, Theory of high-Tc cuprate superconductors. J. Phys. Soc. Jpn. 79, 114705 (2010).
- C. Panagopoulos, J. L. Tallon, B. D. Rainford, T. Xiang, Fluctuation diamagnetism in the high-temperature superconductor YBa2Cu3O7. Nature 413, 282–285 (2001).
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