| Issue |
Europhys. Lett.
Volume 51, Number 2, July 2000
|
|
|---|---|---|
| Page(s) | 174 - 180 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00528-3 | |
| Published online | 01 September 2002 | |
Josephson coupling between superconducting clusters in 
crystals
Instituto de Física “Gleb Wataghin”, UNICAMP - 13083-970, Campinas,
SP, Brazil
Received:
14
December
1999
Accepted:
19
May
2000
Diamagnetic moments for two Bi2Sr2CaCu2O
crystals were measured at different fields H and temperatures. For the
higher fields two distinct transition temperatures 
and 
are
seen, with 
. By increasing H the line 
shifts very
slowly while 
shifts much faster to lower temperatures, displaying
a clear upward curvature well described by a theory based on Josephson
coupling between superconducting clusters. We show further that
is dependent on sample homogeneity, which is correlated with oxygen
distribution in the high-
superconductors.
PACS: 74.20.-z – Theories and models of superconducting state / 74.25.Ha – Magnetic properties / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects
© EDP Sciences, 2000
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