Dynamics of the Magnetic Flux Component Normal to the Layers
of Bi₂Sr₂CaCu₂O₈ in a Tilted Field

V. A. Berezin and V. A. Tulin

Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences,
Chernogolovka, Moscow oblast, 142432 Russia

e-mail: berezin@ipmt-hpm.ac.ru, tulin@ipmt-hpm.ac.ru

Received July 17, 2003; in final form, December 16, 2003

Abstract—High-frequency losses in the strongly anisotropic layered superconductor Bi₂Sr₂CaCu₂O₈ are mea-
sured at 600 MHz under a magnetic field rocking about the ab plane. Anomalies in losses and hysteretic phe-
nomena are found while performing periodic rocking, i.e., cycling the magnetic field component normal to the
sample surface. Based on these observations, conclusions are drawn about the nature of magnetic-flux penetra-
tion into the superconductor. It is found that, in the range between 60 K and T_c, the dynamics of magnetic-flux
vortex lines normal to the ab plane in the presence of a constant magnetic field applied parallel to this plane is
governed by the critical penetration field and the surface barrier in the presence of thermally activated
vortex motion (giant flux creep). The dependences of and the characteristic field of the surface barrier on
the magnitude of the parallel magnetic field are measured. © 2004 MAIK “Nauka/Interperiodica”.

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