| Issue |
Europhys. Lett.
Volume 51, Number 5, September I 2000
|
|
|---|---|---|
| Page(s) | 564 - 570 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00375-2 | |
| Published online | 01 September 2002 | |
Evidence for localized high-
superconducting regions
on the surface of 
-doped 
1
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: milode@vms.huji.ac.il
Received:
14
March
2000
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
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