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Flux-lattice melting, anisotropy, and the role of interlayer coupling in Bi-Sr-Ca-Cu-O single crystals

C. Duran, J. Yazyi, F. de la Cruz, D. J. Bishop, D. B. Mitzi, and A. Kapitulnik
Phys. Rev. B 44, 7737(R) – Published 1 October 1991
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Abstract

We have used the high-Q mechanical-oscillator technique to probe the vortex-lattice structure in high-quality Bi-Sr-Ca-Cu-O single crystals over a wide range of magnetic fields (200 Oe to 40 kOe), and relative orientations θ between the magnetic field and the crystalline c^ axis. In addition to the large softening and dissipation peak previously observed and interpreted as due to flux-lattice melting, another distinctly different peak at higher temperatures is seen. The temperatures where the dissipation peaks take place are solely defined by the parallel component of the field cosθ, while the restoring force on the oscillator is due to both field components. We suggest that the two peaks are due to the softening of interplanar coupling at the low-temperature peak, and melting or depinning of the two-dimensional pancake vortices at the higher-temperature peak.

  • Received 20 March 1991

DOI:https://doi.org/10.1103/PhysRevB.44.7737

©1991 American Physical Society

Authors & Affiliations

C. Duran, J. Yazyi, and F. de la Cruz

  • Centro Atomico Bariloche and Instituto Balseiro, 8400 Santa Cruz de Bariloche, Rio Negro, Argentina

D. J. Bishop

  • AT&T Bell Laboratories, Murray Hill, New Jersey 07974

D. B. Mitzi and A. Kapitulnik

  • Stanford University, Stanford, California 94305

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Vol. 44, Iss. 14 — 1 October 1991

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