Direct determination of the collective pinning radius in the cuprate superconductor Bi2Sr2CaCu2O8+δ

M. I. Dolz, A. B. Kolton, and H. Pastoriza
Phys. Rev. B 81, 092502 – Published 3 March 2010

Abstract

We study the onset of the irreversible magnetic behavior of vortex matter in micron-sized Bi2Sr2CaCu2O8+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, paradoxically implying the existence of a reversible vortex solid. We show that at this irreversibility line, the sample radius can be identified with the crossover length between the Larkin and the random-manifold regimes of the vortex-lattice transverse roughness. Our method thus allows to determine, as a function of temperature and applied magnetic field, the minimum size of a vortex system that can be collectively pinned, or the so-called three-dimensional weak collective pinning Larkin radius, in a direct way.

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  • Received 21 August 2009

DOI:https://doi.org/10.1103/PhysRevB.81.092502

©2010 American Physical Society

Authors & Affiliations

M. I. Dolz, A. B. Kolton, and H. Pastoriza

  • Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, R8402AGP San Carlos de Bariloche, Argentina

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Vol. 81, Iss. 9 — 1 March 2010

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