We have studied the zero bias conductance peak (ZBCP) due to Andreev reflection in BSCCO/Pb and BSCCO/Ag tunneling junctions. According to the conventional BTK theory, the normalized peak height is always less than 2. Surprisingly, the ZBCP in our junctions can be as high as 5. Even more interesting, the ZBCP exhibits unexpected behavior as the normal electrode (Pb) becomes superconducting. We find that the ZBCP will split if the peak is broad, otherwise it will decrease in height. None of these phenomena is observed in BSCCO/Ag junctions, for which Ag remains normal in the whole temperature range.
|Number of pages||3|
|Journal||Journal of Physics and Chemistry of Solids|
|State||Published - 1998|
Bibliographical noteFunding Information:
The authors thank Anjan Gupta, DeWilde, Siyuan Han and E. Wolf for helpful discussions. This work is supported by NSF grant DMR-9623842.
ASJC Scopus subject areas
- Chemistry (all)
- Materials Science (all)
- Condensed Matter Physics