1. Paramagnetic Meissner effect in Bi high-temperature superconductors
- Author
-
N. Knauf, A. Kock, D. Wohlleben, B. Roden, S. Neuhausen, W. Braunisch, Daniel I. Khomskii, Vladislav Kataev, and A. Grütz
- Subjects
Superconductivity ,Statistics::Theory ,High-temperature superconductivity ,Materials science ,Statistics::Applications ,Condensed matter physics ,General Physics and Astronomy ,Magnetic susceptibility ,law.invention ,Paramagnetism ,law ,Meissner effect ,Condensed Matter::Superconductivity ,Diamagnetism ,Absorption (logic) ,Critical field - Abstract
For certain ceramic samples of the Bi-based high-temperture superconductors, the dc-field-cooling signal becomes paramagnetic in fields below a few 100 mOe. This effect correlates with an anomaly in the low-field microwave absorption. The data are consistent with orbital paramagnetic moments due to the appearance of spontaneous supercurrents in fields smaller than the lower critical field ${\mathit{H}}_{\mathit{c}1\mathit{a}}$ parallel to the CuO planes.
- Published
- 1992