Thermally-activated current transport in MgB_2 films

Details Thermally-activated current transport in MgB_2 films Thermally-activated current transport in MgB_2 films

2004-06-12

arxiv.org/abs/cond-mat/0406294v1

Physics

Condensed Matter

Superconductivity

32 Pages, 8 figures, to be published in Physical Review B

Scientific paper

10.1103/PhysRevB.70.064503

Thermally-activated flux flow (TAFF) resistivity above the irreversibility field is reported for two different c-axis textured MgB_2 superconducting films. Transport measurements at different perpendicular magnetic fields 0 < B < 9 T and temperatures from 5 to 40K reveal TAFF Ohmic resistivity described by the Arrhenius law with the quadratic field dependence of the activation energy. Our transport measurements on bulk MgB_2 ceramic samples also show the TAFF behavior, but do not show the quadratic field dependence of U(T,B). We explain our results in terms of thermally-activated drift of pre-existing quenched dislocations in the vortex lattice. Our results indicate that thermal fluctuations can be essential in determining the irreversibility field in MgB2 though to a much lesser extent than in high-temperature superconductors.

Affiliated with

Also associated with

No associations

Rating

Thermally-activated current transport in MgB_2 films does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Thermally-activated current transport in MgB_2 films, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermally-activated current transport in MgB_2 films will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-318209