Angular regimes of ac dynamics and pinning in YBa2Cu3O7 crystals with and without columnar defects

G. Pasquini, L. Civale, H. Lanza, and G. Nieva
Phys. Rev. B 65, 214517 – Published 3 June 2002
PDFExport Citation

Abstract

The main source of vortex pinning near the solid-liquid transition at different orientations of a low dc field in YBa2Cu3O7 crystals with columnar defects is investigated by means of ac susceptibility measurements. The behavior is compared with that observed in nonirradiated samples. It is found that in a very wide angular region the tracks act as correlated defects and are the prevailing source of pinning. The results rule out the existence of an accommodation angle, determined by the competition between the pinning and elastic energies, in twined crystals: the interplay with natural correlated pinning centers has to be taken into account. The linear and nonlinear dynamic regimes when the field is tilted relative to the defects are analyzed. It is clearly shown that characterization of the dynamic regimes is crucial for the correct interpretation of the angular dependence in the ac response.

  • Received 14 December 2000

DOI:https://doi.org/10.1103/PhysRevB.65.214517

©2002 American Physical Society

Authors & Affiliations

G. Pasquini1,*, L. Civale2, H. Lanza3, and G. Nieva2

  • 1Universidad de Buenos Aires, Departamento de Física, Facultad de Ciencias Exactas, Ciudad Universitaria, 1429, Buenos Aires, Argentina
  • 2Comisión Nacional de Energía Atómica-Centro Atómico Bariloche and Instituto Balseiro-8400 Bariloche, Argentina
  • 3Comisión Nacional de Energía Atómica-Departamento de Física, TANDAR, Buenos Aires, Argentina

  • *Corresponding author. Electronic address: gpmm@bigfoot.com

References (Subscription Required)

Click to Expand
Issue

Vol. 65, Iss. 21 — 1 June 2002

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×