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Enhancement of vortex pinning by Josephson coupling of two-dimensional pancake vortices in heavy lead-doped Bi [iopmath latex="$_{2-x}$"] 2-x [/iopmath] Pb [iopmath latex="$_x$"] x [/iopmath] Sr2CaCu2O [iopmath latex="$_y$"] y [/iopmath]

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Magnetic hysteresis loops and magnetic relaxation have been measured for pure and heavily lead-doped Bi [iopmath latex="$_{2-x}$"] 2-x [/iopmath] Pb [iopmath latex="$_x$"] x [/iopmath] Sr2CaCu2O [iopmath latex="$_y$"] y [/iopmath] (Bi2212) single crystals. From the hysteresis loop measurements, the normalized critical current density [iopmath latex="$J_c/J_{c0}$"] Jc/Jc0 [/iopmath] has been calculated, and from the relaxation measurements the activation energy, current-voltage curves and normalized relaxation rate have been obtained. The field and temperature dependences of [iopmath latex="$J_c/J_{c0}$"] Jc/Jc0 [/iopmath] for Pb-doped crystals were much weaker than for the pure Bi2212 crystals. A large upward shift in the crossover temperature [iopmath latex="$T_{CR}$"] TCR [/iopmath] , a temperature separating two different pinning regimes, has been observed for the first time with heavy lead doping. This was interpreted by improved inter-layer Josephson coupling of two-dimensional vortices, as a result of Pb doping. Heavily Pb-doped crystal had [iopmath latex="$T_{CR}=35$"] TCR = 35 [/iopmath]  K for the field that was within the secondary peak in its magnetic hysteresis loop. For pure Bi2212, [iopmath latex="$T_{CR}=19$"] TCR = 19 [/iopmath]  K.

Document Type: Miscellaneous

Publication date: January 1, 2001


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