Noise dependence on magnetic field in granular bulk high-Tc superconductors
M. Celasco, R. Eggenhöffner, E. Gnecco, A. Masoero
DOI 10.1103/PhysRevB.58.6633 · Physical Review B
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Abstract
The increase in voltage noise observed by increasing magnetic field in granular high-Tc superconductors is explained in the framework of a percolative model. Noise is reproduced with computer simulations of a network of junctions, many of which are randomly shorted. The network configuration is representative of interconnections (weak links) of grains in polycrystalline bulk samples. With respect to previous percolative models, we have demonstrated that the calculated noise intensity is modified when interdependence between different configurations in the time evolution of the network is considered. The concordance with the experimental dependence of noise on resistance at different magnetic field intensities in YBa2Cu3O7−δ and HgBa2CuO4+δ supports the hypothesis that magnetic field affects the fluxon speed and thus the switching rate of weak links.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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