Issue |
Europhys. Lett.
Volume 60, Number 6, December 2002
|
|
---|---|---|
Page(s) | 910 - 916 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2002-00304-5 | |
Published online | 01 December 2002 |
Magneto-optical analysis of second-peak effect in BSCCO single crystals
INFM-UdR Torino Politecnico INFN, Sezione di Torino
Dipartimento di Fisica, Politecnico di Torino
C.so Duca degli Abruzzi 24, 10129 Torino, Italy
Received:
30
May
2002
Accepted:
27
September
2002
We report on magneto-optical (MO) analysis on slightly overdoped
single crystals of
+x, focusing on the
second-peak effect. In particular, we measure the local values of
the virgin magnetisation, M, and, for the first time in BSCCO,
at our best knowledge, of the local current density, J, as a
function of the local magnetic induction field, Bz. Patterns
clearly due to the second-peak effect are observed and mutually
compared. From the same analysis repeated in different sample
zones having the same size, it turns out that the second peak
slightly shifts with the position inside the sample. The peak
sharpness and depth decrease when the size of the considered
region increases, whereas the peak disappears if the region
includes several defects observable at the MO resolution. All the
experimental evidences point towards a correlation between the
second-peak effect and the local disorder at different scales.
PACS: 74.25.Dw – Superconductivity phase diagrams / 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 74.72.Hs – Bi-based cuprates
© EDP Sciences, 2002
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