Observation of microscopic currents in superconducting ceramics
J. Albrecht, Ch. Jooss, R. Warthmann, A. Forkl, H. Kronmüller
DOI 10.1103/PhysRevB.57.10332 · Physical Review B
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Abstract
The microscopic screening currents circulating in the grains of the ceramic high-Tc superconductor YBa2Cu3O7−δ in a magnetic field are visualized by computing the current density with high spatial resolution of more than 106 pixels from magneto-optic images taken at the specimen surface with the same high resolution. Having solved several technical and mathematical problems, we can visualize the supercurrent density distribution inside and between the grains of a macroscopic polycrystalline specimen and make quantitative statements. Our method may thus be used to optimize the current-carrying capability of superconducting ceramics.
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 |
| YBa2Cu3O7 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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