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- W1651073698 abstract "We have investigated the thermally activated behavior of the in-plane electrical resistivity of ${mathrm{Bi}}_{2}{mathrm{Sr}}_{2}{mathrm{CaCu}}_{2}{mathrm{O}}_{8+mathrm{ensuremath{delta}}}$ films for magnetic fields $B<~{10}^{4}mathrm{G}$ applied parallel to the $c$ axis. The activation energy in the vortex-liquid state changes suddenly at a crossover field ${B}_{mathrm{cr}}.$ The anisotropy reduction generated by oxygen annealing leads to the increase of the crossover field. For $B<{B}_{mathrm{cr}},$ the activation energy $U$ is weakly magnetic-field dependent. For $B>{B}_{mathrm{cr}},$ $U(B,T)ensuremath{sim}(1ensuremath{-}{T/T}_{c0}{)/B}^{1/2},$ which corresponds to an entangled vortex fluid. The observation of vortex-liquid entanglement in the presence of relevant quenched disorder is discussed in connection with the relation between the theoretically predicted entanglement length for a clean system and the collective pinning length along the field direction. Our results suggests that, in the case of a pronounced anisotropy and significant collective pinning, the entanglement field ${B}_{E}{=B}_{mathrm{cr}}ensuremath{approx}{ensuremath{Phi}}_{0}/{ensuremath{gamma}}^{2}{s}^{2},$ where $s$ is the interlayer spacing." @default.
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- W1651073698 date "1998-02-01" @default.
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- W1651073698 title "Vortex-liquid entanglement in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CaCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn…" @default.
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- W1651073698 doi "https://doi.org/10.1103/physrevb.57.3151" @default.
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