Dimensional Crossover of Vortex Dynamics Induced by Gd Substitution on Bi2212 Single Crystals

Details Dimensional Crossover of Vortex Dynamics Induced by Gd Substitution on Bi2212 Single Crystals Dimensional Crossover of Vortex Dynamics Induced by Gd Substitution on Bi2212 Single Crystals

2003-03-03

arxiv.org/abs/cond-mat/0303020v1

Physica C391, 169-177(2003)

Physics

Condensed Matter

Superconductivity

16 Pages, 6 Figures, To appear in Physica C

Scientific paper

10.1016/S0921-4534(03)00890-6

The vortex dynamics of Bi$_2$Sr$_2$Ca$_{1-x}$Gd$_x$Cu$_2$O$_{8+\delta}$ single crystals is investigated by magnetic relaxation and hysteresis measurements. By substituting $Ca$ with $Gd$, it is found that the interlayer Josephson coupling is weakened and the anisotropy is increased, which leads to the change of vortex dynamics from 3D elastic to 2D plastic vortex creep. Moreover, the second magnetization peak, which can be observed in samples near the optimal doping, is absent in the strongly underdoped (with 2D vortex) region.

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