Ranulfo Allen, John Baglin, et al.
J. Photopolym. Sci. Tech.
Local magnetization and local permeability in the mixed state of Bi2Sr2CaCu2O8+y, single crystals have been measured by using a micro-Hall-probe. When temperature is decreased in the vortex lattice phase, local magnetic induction shows step-like decrease, indicating that vortices are expelled from the sample discontinuously. This behavior suddenly disappears at the so-called depinning temperature. In addition to this, broad band low-frequency noise in the local permeability is observed in the region where the discontinuous vortex expulsion occurs. The noise spectrum shows a power-law behavior. Magnetic field dependence of the local permeability suggests that these phenomena are related to the bulk pinning. The discontinuous vortex expulsion and the power-law behavior of the local permeability noise are consistently explained by the vortex avalanches in the vortex lattice phase. © 2000 Elsevier Science B.V. All rights reserved.
Ranulfo Allen, John Baglin, et al.
J. Photopolym. Sci. Tech.
S.F. Fan, W.B. Yun, et al.
Proceedings of SPIE 1989
Kigook Song, Robert D. Miller, et al.
Macromolecules
A. Krol, C.J. Sher, et al.
Surface Science