Vortex phase diagram and temperature-dependent second-peak effect in overdoped Bi$_{2}$Sr$_{2}$CuO$_{6 + δ}$ crystals

Details Vortex phase diagram and temperature-dependent second-peak effect in overdoped Bi$_{2}$Sr$_{2}$CuO$_{6 + δ}$ crystals Vortex phase diagram and temperature-dependent second-peak effect in overdoped Bi$_{2}$Sr$_{2}$CuO$_{6 + δ}$ crystals

2010-04-07

arxiv.org/abs/1004.1022v1

Physical Review B, vol. 81, Issue 14, id. 144517, 2010

Physics

Condensed Matter

Superconductivity

9 figures

Scientific paper

10.1103/PhysRevB.81.144517

We study the vortex phase diagram of the single-layer Bi2Sr2CuO6+d (Bi2201) superconductor by means of bulk magnetization measurements on high-quality oxygen-overdoped crystals. In striking contrast with the results found in the moderately-doped two and three-layer Bi-based cuprates, Bi2201 exhibits a strong temperature-dependent second-peak e?ffect. By means of measurements of the in and out-of-plane ?first-penetration ?field we provide direct evidence that this phenomenon is mainly associated to an increase of the electromagnetic anisotropy on warming. The e?ffect of oxygen-doping d on the vortex phase diagram results in both the irreversibility and second-peak lines shifting to higher temperatures and fi?elds. This enhanced stability of the Bragg glass phase suggests that the interlayer coupling between Cu-O layers increases with d. In addition, we found that the critical temperature follows the parabolic relation with the number of holes per Cu-O plane that holds for most single and two-layer cuprates.

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