Complete inversion of the Meissner effect in Bi2Sr2CaCu2O8+δ ceramics at ultralow fields
J. Kötzler, M. Baumann, N. Knauf
DOI 10.1103/PhysRevB.52.1215 · Physical Review B
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Abstract
Using high-resolution superconducting quantum interference device magnetometry, the field-cooled magnetization MFC of Bi-2212 ceramics with bulk transition temperatures between 62 and 93 K has been investigated from 0.5 mOe to 5 Oe. Upon diamagnetic backgrounds of different magnitude and temperature variation, for all materials a positive contribution to MFC appears, which increases to a formally inverted Meissner effect at the lowest fields, M+=H. The temperature variations of the diamagnetic and inverted responses indicate a common effect of a thermally activated process on both signals.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93.2 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 72 | Pressure not reported | unknown |
| Bi1.8Pb0.2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 62 | Pressure not reported | unknown |
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