We report magnetic studies of the paramagnetic effect observed in the superconducting nano-structured opal-lead system. Positive magnetization is clearly observed when the sample is cooled in field. The paramagnetic effect is strongly dependent on the applied field and the cooling rate. The results suggest that the paramagnetic moment is due to flux trapping and the competition between the positive and negative moments due to the temperature dependence of the penetration depth.
- Flux trapping
- Paramagnetic effect
- Superconducting nano-structure
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics