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arXiv · 0905.1805

Direct determination of the collective pinning radius in high temperature superconductors

Moira I. Dolz·Alejandro B. Kolton·Hernan Pastoriza
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Abstract

We study finite-size effects at the onset of the irreversible magnetic behaviour of micron-sized Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ 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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Moira I. Dolz, Alejandro B. Kolton, Hernan Pastoriza. 2009-05-12. Direct determination of the collective pinning radius in high temperature superconductors. https://doi.org/10.1103/physrevb.81.092502

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