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Electrical transport, magnetic, and structural properties of the vortex lattice of V_3Si in the vicinity of the peak effect

A. A. Gapud·D. K. Christen·J. R. Thompson·M. Yethiraj
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Abstract

The peak effect in critical current density J_c is investigated by studying the flux dynamics in V_3Si using bulk magnetometry, small-angle neutron scattering, and transport measurements on clean single-crystal samples from the same ingot. For a field-cooled history, well-defined structure in the vortex lattice was found for fields and temperatures (H,T) below the peak-effect line H_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 system is reproducibly re-ordered either by field-cooling or a low-frequency, pulsed "shaking" transport current. The latter is shown to attain Bardeen-Stephen flux flow. In addition, flux flow is observed at H_P(T) at high current levels. The results, though novel, support the traditional picture of H_P(T) as an order-disorder transition due to the competition between elasticity and pinning.

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A. A. Gapud, D. K. Christen, J. R. Thompson, M. Yethiraj. 2003-01-31. Electrical transport, magnetic, and structural properties of the vortex lattice of V_3Si in the vicinity of the peak effect. https://doi.org/10.1103/physrevb.67.104516

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