Direct determination of the collective pinning radius in high temperature superconductors

Details Direct determination of the collective pinning radius in high temperature superconductors Direct determination of the collective pinning radius in high temperature superconductors

2009-05-12

arxiv.org/abs/0905.1805v1

Physical Review B 81, 092502 (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figs

Scientific paper

10.1103/PhysRevB.81.092502

We study finite-size effects at the onset of the irreversible magnetic behaviour of micron-sized Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ single crystals by using silicon micro-oscillators. We find an irreversibility line appearing well below the thermodynamic Bragg-glass melting line at a magnetic field which increases both with increasing the sample radius and with decreasing the temperature. We show that this size-dependent irreversibility line can be identified with the crossover between the Larkin and the random manifold regimes of the vortex lattice transverse roughness. Our method allows to determine the three-dimensional weak collective pinning Larkin radius in a {\it direct way}.

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