Vortex phase diagram of Bi2Sr2CaCu2O8+δ: c-axis superconducting correlation in the different vortex phases

M. F. Goffman, J. A. Herbsommer, F. de la Cruz, T. W. Li, and P. H. Kes
Phys. Rev. B 57, 3663 – Published 1 February 1998
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Abstract

The vortex phase diagram in Bi2Sr2CaCu2O8+δ is investigated by studying the linear ac transverse permeability μ=μ+μ(hacHc axis) in a wide range of temperature and magnetic fields. At low fields (H<300Oe)superconducting phase coherence in the c direction shows that the ordered vortex solid state is characterized by a c-axis vortex correlation length lc limited by the sample thickness d. At low temperatures (T<20K) point disorder is sufficiently strong and the phase coherent ordered vortex solid becomes metastable. In the temperature range 20<T<42K when the applied field exceeds Hent(T), the ordered vortex state transforms into an entangled state with no indication of reduction of lc. At a higher crossover field the linear response becomes Ohmic, lc<d. At higher temperatures the vortex structure becomes an uncorrelated vortex liquid in all directions.

  • Received 8 August 1997

DOI:https://doi.org/10.1103/PhysRevB.57.3663

©1998 American Physical Society

Authors & Affiliations

M. F. Goffman, J. A. Herbsommer, and F. de la Cruz

  • Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, S. C. de Bariloche, 8400 RN, Argentina

T. W. Li and P. H. Kes

  • Kammerling Onnes Laboratory, Rijksuniversiteit Leiden, P.O. Box 9506 2300 RA Leiden, The Netherlands

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Vol. 57, Iss. 6 — 1 February 1998

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