Anomalous flux dynamics in magnesium diboride films

M. N. Kunchur, University of South Carolina
G. Saracila, University of South Carolina
D. A. Arcos, University of South Carolina
Y. Cui, Pennsylvania State University
A. Pogrebnyakov, Pennsylvania State University
P. Orgiani, Pennsylvania State University
X. X. Xi, Pennsylvania State University
P. W. Adams, Louisiana State University
D. P. Young, Louisiana State University


The flux dynamics in magnesium diboride films becomes altered by scattering resulting in an unprecedented quenching of flux motion that is beyond conventional vortex pinning. At currents approaching the pair-breaking value and magnetic fields approaching the upper-critical field, the conductance diverges and the current-resistance and temperature-conductance curves become parallel, showing mainly a shift in the transition due to pair-breaking with minimal signs of flux motion. © 2005 Elsevier B.V. All rights reserved.