Inducing the paramagnetic Meissner effect in Nb disks by surface ion implantation
David J. Thompson, L. E. Wenger, J. T. Chen
DOI 10.1103/PhysRevB.54.16096 · Physical Review B
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Abstract
After implanting Kr ions to a depth of 120 nm below both surfaces of disk-shaped Nb samples, the magnetization in a field-cooling measurement becomes positive at temperatures slightly below the superconducting transition temperature Tc≊9.2 K. In contrast, the field-cooled magnetization on similar disks prior to the ion implanting was diamagnetic. This behavior confirms earlier evidence that the paramagnetic Meissner effect (PME) is extremely sensitive to the surface microstructure. Furthermore the occurrence of the PME in these ion-implanted Nb disks results from the existence of lower Tc surface defects having a sufficient depth relative to the disk thickness such that the resulting strong flux pinning from these defects gives rise to an inhomogeneous local field distribution. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.2 | Pressure not reported | onset |
| Bi2Ba2CaCu2Oy 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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