Critical flux pinning and enhanced upper-critical-field in magnesium diboride films

Details Critical flux pinning and enhanced upper-critical-field in magnesium diboride films Critical flux pinning and enhanced upper-critical-field in magnesium diboride films

2003-11-15

arxiv.org/abs/cond-mat/0311364v1

Phys. Rev. B 68, 100503 (2003)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.68.100503

We have conducted pulsed transport measurements on c-axis oriented magnesium diboride films over the entire relevant ranges of magnetic field $0 \alt H \alt H_{c2}$ (where \hcu is the upper critical field) and current density $0 \alt j \alt j_{d}$ (where $j_{d}$ is the depairing current density). The intrinsic disorder of the films combined with the large coherence length and three-dimensionality, compared to cuprate superconductors, results in a six-fold enhancement of $H_{c2}$ and raises the depinning current density $j_{c}$ to within an order of magnitude of $j_{d}$. The current-voltage response is highly non-linear at all fields, resulting from a combination of depinning and pair-breaking, and has no trace of an Ohmic free-flux-flow regime. Keywords: pair, breaking, depairing, superconductor, superconductivity, flux, fluxon, vortex, mgb2

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