INVESTIGADORES
NIEVA Gladys Leonor
artículos
Título:
Oscillatory dynamics in the vortex matter of twinned and untwinned YBa2Cu3O7 crystals
Autor/es:
G. PASQUINI; D. LUNA; G. NIEVA
Revista:
PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS
Editorial:
American Physical Society
Referencias:
Año: 2007 vol. 76 p. 2123021 - 2123024
ISSN:
0163-1829
Resumen:
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.
