LONGITUDINAL ELASTIC CORRELATION LENGTH OF FLUX LINES
ALONG THE $c$-AXIS NEAR THE PEAK FIELD IN Bi-2212 SINGLE
CRYSTAL
Title, author, abstract
- title
-
LONGITUDINAL ELASTIC CORRELATION LENGTH OF FLUX LINES
ALONG THE $c$-AXIS NEAR THE PEAK FIELD IN Bi-2212 SINGLE
CRYSTAL
- authors
-
M. Kiuchi, H. Yamato, T. Matsushita
Department of Computer Science and Electronics, Kyushu
Institute of Technology,
680--4 Kawazu, Iizuka, 820 JAPAN
- abstract
-
The longitudinal elastic correlation length, $l_{\rm 44}$,
of flux lines in a single crystal Bi-2212 superconductor is
measured in the vicinity of the peak field using the
Campbell method with the magnetic field parallel to the
$c$-axis. It is found that $l_{\rm 44}$ in this region is of
the order of $1~\mu$m and much longer than the distance
between the CuO$_{2}$ layers. In addition, $l_{\rm 44}$
depends on the magnetic field and temperature. These results
agree well with the pinning correlation length estimated
using the measured critical current density, $J_{\rm c}$.
The apparent pinning potential estimated from the magnetic
relaxation measurement takes a peak near the peak field and
agrees well with the result of collective flux creep theory
in which the obtained $J_{\rm c}$ and $l_{\rm 44}$ are used.
It is concluded from these results that the flux lines are
strongly coupled over a fairly long distance along the
$c$-axis even in the vicinity of peak field.
- Original paper appears in
-
9th International Symposium on Superconductivity
October 21--25, 1996
Sapporo, Hokkaido, Japan