Electrical transport, magnetic, and structural properties of the vortex lattice of V3Si in the vicinity of the peak effect

Article

关键词: ANGLE NEUTRON-SCATTERING;    FLUX-LINE-LATTICE;    HISTORY DEPENDENCE;    ORDER TRANSITION;    SINGLE-CRYSTAL;    EFFECT REGIME;    SUPERCONDUCTOR;    PHASE;    METASTABILITY;    INSTABILITIES;   

DOI  :  10.1103/PhysRevB.67.104516

来源: SCIE

【 摘 要 】

The peak effect in critical current density J(c) is investigated by studying the flux dynamics in V3Si 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 support the traditional picture of H-P(T) as an order-disorder transition due to the competition between elasticity and pinning.

【 授权许可】

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