By combining micro-Hall probe and magneto-optical imaging techniques we have been able to examine vortex avalanches at different locations of the ridgelike magnetic topography of superconducting niobium samples as the external field is slowly increased. The avalanche size distributions are shown to be power laws for two decades with very similar critical exponents at all locations, thus demonstrating a remarkable robustness in the details of the flux penetration dynamics.
|Physical Review B - Condensed Matter and Materials Physics
|Published - Oct 2004
Bibliographical noteFunding Information:
We appreciate the discussions with P. Bak, A. J. Batista-Leyva, H. Jaeger, B. Lorenz, R. Mulet, M. Paczuski, D. V. Shantsev, A. Malthe-Sørenssen, and Y. Xue. The authors thank the support by the World Laboratory Center for Pan-American Collaboration in Science and Technology, the Research Council of Norway, the National Science Foundation, the Israel Science Foundation–Center of Excellence Program, the “Alma Mater” grants program (University of Havana), and the U.S. Department of Energy. The work in Houston was supported in part by the State of Texas through the Texas Center for Superconductivity and Advanced Materials at the University of Houston.