Abstract
Interlayer pancake vortex arrangement is studied by Josephson plasma resonance in Bi 2Sr 2CaCu 2O 8+ y with columnar defects in a wide range of matching field B Φ (5 G ∼ 40 kG). The c-axis coherence is found to be drastically enhanced above a characteristic field H* in the vortex liquid state, which we interpreted as recoupling of pancake vortices by columnar defects. The recoupling field H* scales as (0.2–0.3) B Φ at high doses ( B Φ > 500 G), but at lower doses it is almost constant ( H* ∼ 60 Oe), suggesting that the recoupling occurs when vortex-vortex interactions are significant at low doses. At high doses we found that (1) H* does not depend on oxygen content of the crystal and (2) when columnar defects are introduced at an angle θ from the c axis, H* is scaled as (0.2–0.3) B Φ cos θ. These results indicate that the recoupling at high doses is controlled only by the density of defects in each CuO 2 layers.
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