Oscillatory dynamics in the vortex matter of twinned and untwinned YBa2Cu3O7 crystals

G. Pasquini, D. Luna, and G. Nieva
Phys. Rev. B 76, 212302 – Published 18 December 2007

Abstract

Experiments of oscillatory dynamics in twinned YBa2Cu3O7 (YBCO) crystals in a dc magnetic field tilted with respect to the twin planes indicate that history effects (HEs) in these samples cannot be ascribed to an equilibration process but have its origin in the oscillatory character of the vortex dynamics. However, the role that extended twin boundaries play in the HEs of YBCO crystals has been the subject of controversies until now. In this work, we study the role of correlated defects in the dynamic history effects by performing angular ac susceptibility measurements in twinned and detwinned YBCO crystals. We confirm that in any case, whenever HEs are observed, the temporal symmetry of the shaking ac field plays a major role.

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  • Received 28 June 2007

DOI:https://doi.org/10.1103/PhysRevB.76.212302

©2007 American Physical Society

Authors & Affiliations

G. Pasquini* and D. Luna

  • Laboratorio de Bajas Temperaturas, Departamento de Física, Universidad de Buenos Aires, Pabellon 1, Ciudad Universitaria, C1428EGA Buenos Aires, Argentina

G. Nieva

  • Instituto Balseiro, CAB, Comisión Nacional de Energía Atómica, Avenida Bustillo Km 8.5, R8401BLA Bariloche, Argentina

  • *pasquini@df.uba.ar

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Vol. 76, Iss. 21 — 1 December 2007

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