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From the I–V characteristics for as-grown and irradiated Bi2Sr2CaCu2O8+δ single crystals at T=5K in a magnetic field applied parallel to the c axis, we have seen two types of vortex dynamics near the depinning threshold. For the as-grown sample, at low field, the I–V curves show steps that clearly indicate a “fingerprint phenomenon” since they reflect the current dependence of differential resistance...
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