BSCCO tipi süperiletkenlerin manyetik özelliklerinin taramalı hall aygıtı mikroskobu ile incelenmesi

ABSTRACT INVESTIGATION OF THE MAGNETIC PROPERTIES OF BSCCO SUPERCONDUCTORS WITH SCANNING HALL PROBE MICROSCOPE Münir Dede M.S. in Physics Supervisor: Assoc. Prof. Dr. Ahmet Oral September, 2002 A low temperature scanning Hall probe microscope (LT-SHPM) with low noise GaAs/AlGaAs 2DEG Hall probes is used to investigate the magnetic properties of a Ag-sheathed BSCCO-2223 tape and a single crystal BSCCO-2212 supercon ductor. The Hall probes are micro fabricated with 1 //m wide Hall bars which have ~0.85 /tm electrical width. The magnetization behavior, vortex structures and the vortex lattice melting are observed at 77 K. Flux penetration into the BSCCO-2212 single crystal is also observed and imaged with single vortex resolution. Keywords: Scanning Hall Probe Microscopy (SHPM), Hall probes, Magg|pSation measurement, Superconductivity, BSCCO, Single quantum flux. m