Anomalous ac magnetic susceptibility of high-temperature YBa2Cu3O7−δ superconductors
D.-X. Chen, E. Pardo, A. Sanchez, S.-S. Wang, Z.-H. Han, E. Bartolome, T. Puig, X. Obradors
DOI 10.1103/PhysRevB.72.052504 · Physical Review B
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Abstract
An anomalous effect in the low-field ac susceptibility of YBa2Cu3O7−δ superconductors with strong frequency dependence is presented. This phenomenon appears in samples whose intergranular currents flow with low values, and its existence is analyzed in terms of the presense of Josephson vortices and their thermally activated creep of Kim-Anderson type with small pinning potential. Its existence highlights a possible problem in the research and development of high-temperature superconductors; some materials with high Jc defined by E=Ec=10−4V∕m may still have a large resistivity at lower E.
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. | 77 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 77 | Pressure not reported | unknown |
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