Inducing the paramagnetic Meissner effect in Nb disks by surface ion implantation
- Department of Physics and Astronomy and Institute for Manufacturing Research, Wayne State University, Detroit, Michigan 48202 (United States)
- Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48202 (United States)
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 {ital T}{sub {ital c}}{approx_equal}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 {ital T}{sub {ital c}} 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. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 399823
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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