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The peak effect in critical current density J_c is investigated by studyingthe flux dynamics in V_3Si using bulk magnetometry, small-angle neutronscattering, and transport measurements on clean single-crystal samples from thesame ingot. For a field-cooled history, well-defined structure in the vortexlattice was found for fields and temperatures (H,T) below the peak-effect lineH_P(T); above this line, the structure disappeared. History-dependent,metastable disorder is found only for (H,T) below H_P(T) but the vortex systemis reproducibly re-ordered either by field-cooling or a low-frequency, pulsed"shaking" transport current. The latter is shown to attain Bardeen-Stephen fluxflow. In addition, flux flow is observed at H_P(T) at high current levels. Theresults, though novel, support the traditional picture of H_P(T) as anorder-disorder transition due to the competition between elasticity andpinning.Comment: 24 pages, 10 figs, 525 KB PDF; submitted to Phys. Rev.

physical review. b, condensed matter

Electrical transport, magnetic, and structural properties of the vortex lattice of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">V</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:math>in the vicinity of the peak effect

Electrical transport, magnetic, and structural properties of the vortex lattice ofV3Siin the vicinity of the peak effect