Evidence for localized high- superconducting regions on the surface of -doped
Racah Institute of Physics, The Hebrew University - Jerusalem 91904, Israel
2 Department of Materials and Interfaces, The Weizmann Institute of Science Rehovot 76100, Israel
Corresponding author: firstname.lastname@example.org
Accepted: 3 July 2000
Scanning tunneling spectroscopy along with magnetization measurements were employed in the study of -doped . The magnetization data suggest that a superconducting phase is formed below K. Tunneling experiments reveal islands, 20–150 nm in size, having a superconductor-like density of states. These islands cover about 10% of the surface, the rest of which is insulating, and exhibit spectroscopic gaps having values up to . Therefore this material seems to be a non-cuprate superconductor with a high critical temperature.
PACS: 74.10.+v – Superconductivity: Occurrence, potential candidates / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.80.-g – Spatially inhomogeneous structures
© EDP Sciences, 2000