2018 March Meetingn - pnictides

Abstract: Motivated by reports of filamentary superconductivity in the Iron-based Ba pnictide superconductors (Ba122), we used a scanning SQUID (Superconducting Quantum Interference Device), with sub-micron resolution, to detect local magnetization and susceptibility variation of Ba122 single crystals. We found evidence of both weak local diamagnetism and static magnetization. Intriguingly, the magnetization seems to appear on certain facets of the crystal. 

Ruby Shi, Johanna Palmstrom, John Kirtley, Hilary Noad, Kathryn A. Moler, Ian Fisher