### Title, author, abstract

title
LONGITUDINAL ELASTIC CORRELATION LENGTH OF FLUX LINES ALONG THE c-AXIS 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
To investigate the behavior of flux lines along the $c$-axis in two-dimensional layered superconductors, the longitudinal elastic correlation length, $l_{\rm 44}$, of the flux lines in a single crystal Bi-2212 superconductor is measured using the Campbell method. It is found that $l_{\rm 44}$ is of the order of 10 $\mu$m and four orders of magnitude longer than the distance between the CuO$_{2}$ layers. It is concluded that the flux lines are strongly coupled over a fairly long distance along the $c$-axis. The observed $l_{\rm 44}$ agrees well with the pinning correlation length calculated using the measured critical current density. The apparent pinning potential estimated from the magnetic relaxation measurement agrees with the result of collective flux-creep theory.
Original paper appears in
8th International Workshop on Critical Current
May 27-29, 1996
Kitakyushu, Japan