Local voltage-current characteristics in high-Tc superconductors
D. Giller, Y. Abulafia, R. Prozorov, Y. Wolfus, A. Shaulov, Y. Yeshurun
DOI 10.1103/PhysRevB.57.R14080 · Physical Review B
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Abstract
Local electric field versus current density (E−j) curves were measured in YBa2Cu3O7−δ and Nd1.85Ce0.15CuO4−δ single crystals using a miniature Hall-sensors array. Measurements in the field range corresponding to the anomalous magnetization peak in these crystals reveal remarkably different E−j characteristics below and above the peak, indicating a crossover in the flux-creep mechanism. Similar E−j behavior, as observed here in YBa2Cu3O7−δ and Nd1.85Ce0.15CuO4−δ, is expected universally in every superconductor exhibiting the anomalous peak.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | unknown |
| Nd1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | unknown |
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