Investigation of the dB/dH effect using trapped flux in type-II superconductors
M. A. R. LeBlanc, Sean X. Wang, David LeBlanc, Martin Krzywinski, Jinglei Meng
DOI 10.1103/PhysRevB.52.12895 · Physical Review B
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Abstract
We show that the dB/dH effect (i.e., a ‘‘discontinuity’’ in the B profile) should manifest itself quite dramatically in plots of 〈B〉rem/〈B〉in vs either 〈B〉in or vs 〈B〉rem. Here 〈B〉in is the magnetic-flux density permeating the zero-field-cooled specimen in the presence of an applied magnetic field Ha and 〈B〉rem is the remanent magnetic-flux density after Ha has been removed. Our data on the five materials we have investigated (two weak pinning, two intermediate, and one strong pinning low-Tc type-II superconductors) graphed in these discriminating formats show no evidence of a dB/dH effect.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb0.86In0.14 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Pb0.45Bi0.55 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nb0.5Ta0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NbZr 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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