Vortex phase diagram and temperature-dependent second-peak effect in overdoped Bi2Sr2CuO6+δ crystals

A. Piriou, E. Giannini, Y. Fasano, C. Senatore, and Ø. Fischer
Phys. Rev. B 81, 144517 – Published 28 April 2010

Abstract

We study the vortex phase diagram of the single-layer Bi2Sr2CuO6+δ (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 effect. By means of measurements of the in-plane and out-of-plane first-penetration field we provide direct evidence that this phenomenon is mainly associated to an increase in the electromagnetic anisotropy on warming. The effect of oxygen-doping δ on the vortex phase diagram results in both the irreversibility and second-peak lines shifting to higher temperatures and fields. This enhanced stability of the Bragg glass phase suggests that the interlayer coupling between Cu-O layers increases with δ. 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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  • Received 2 September 2008

DOI:https://doi.org/10.1103/PhysRevB.81.144517

©2010 American Physical Society

Authors & Affiliations

A. Piriou*, E. Giannini, Y. Fasano, C. Senatore, and Ø. Fischer

  • Département de Physique de la Matière Condensée, Université de Genève, 24 Quai Ernest-Ansermet, 1211 Geneva, Switzerland

  • *alexandre.piriou@unige.ch
  • Present address: Instituto Balseiro and Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, Avenida Bustillo 9500, 8400 Bariloche, Argentina.

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Vol. 81, Iss. 14 — 1 April 2010

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