Volume 36, Number 2, October II 1996
|Page(s)||141 - 146|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|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
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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