Issue |
Europhys. Lett.
Volume 63, Number 4, August 2003
|
|
---|---|---|
Page(s) | 590 - 596 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-00554-7 | |
Published online | 01 November 2003 |
Enhancement of Josephson coupling in
by doping of
vapor during sintering
Electron Microscopy Laboratory, School of Materials Science and Engineering Tsinghua University - Beijing 100084, PRC
Corresponding author: jzhu@mail.tsinghua.edu.cn
Received:
13
November
2002
Accepted:
12
June
2003
The transport properties of prepared
under ambient atmosphere, using
vapor as doping
resource, have been investigated in this paper. Two distinct
transition temperatures were found from the doped sample. The
high-temperature one, occurring at about 35
, comes from the
known 32
phase. The other one appearing near 10
is
regarded as the result of Josephson coupling. Compared to the
doped sample, the undoped sample shows weak Josephson coupling. We
argue that the enhancement of Josephson coupling results from
denser and more compacted grain boundaries in the doped sample,
while the undoped sample has larger fractions of pores, which are
harmful to this coupling. An interesting phenomenon is also
observed: when Josephson coupling disappears due to an applied
magnetic field or time elapse, the resistance increases as a
power law,
, in the low-temperature region.
PACS: 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 74.25.-q – Properties of type I and type II superconductors / 74.72.-h – Cuprate superconductors (high- and insulating parent compounds)
© EDP Sciences, 2003
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