Issue |
Europhys. Lett.
Volume 36, Number 2, October II 1996
|
|
---|---|---|
Page(s) | 141 - 146 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1996-00200-6 | |
Published online | 01 September 2002 |
Evidence for collective δTc pinning in superconducting (K,Ba)BiO3 single crystals
Laboratoire d'Etudes des Propriétés
Electroniques des Solides,
Centre National de la Recherche Scientifique - BP 166, 38042 Grenoble
Cedex 9, France
Received:
5
June
1996
Accepted:
4
September
1996
The nature of pinning has been investigated in the three-dimensional
high-Tc
superconductor . We show that the magnetic-field dependence of
the
critical current deduced from pulsed-field magnetization measurements can be
well described by the collective-pinning theory on a large temperature range
. This permits us to construct a nonequilibrium
H-T
phase diagram including both
the single-vortex and vortex bundle regimes. Furthermore, the temperature
dependence of the collective-pinning length Lc is in excellent
agreement with
a model of flux pinning induced by spatial fluctuations of the critical
temperature (
pinning model).
PACS: 74.60.Jg – Critical currents / 74.25.Ha – Magnetic properties / 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics
© EDP Sciences, 1996
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