The pair-breaking critical current density of magnesium diboride

Details The pair-breaking critical current density of magnesium diboride The pair-breaking critical current density of magnesium diboride

2002-12-05

arxiv.org/abs/cond-mat/0212108v1

Phys. Rev. B 68, 064516 (2003)

Physics

Condensed Matter

Superconductivity

Submitted to Phys. Rev. Lett. Related preprints/reprints by our group can be found on http://www.physics.sc.edu/kunchur

Scientific paper

10.1103/PhysRevB.68.064516

The pair-breaking critical current density j_{d} of magnesium diboride was determined over its entire temperature range by a pulsed dc transport measurement. At fixed low values of current density j, the resistive transition temperature Tc shifts in the classic \Delta T_{C}(j)/T_{C}(0) \propto -[j/j_{d}(0)]^{2/3} manner, with a projected j_{d}(0) \approx 2 \times 10^{7}$ A/cm^{2}. The directly measured j_{d}(0), from current-voltage ($I$-$V$)curves at different fixed temperatures, has a similar value and the overall temperature dependence j_{d}(T) and magnitude are consistent with Ginzburg-Landau theory. Keywords: pair, breaking, depairing, superconductor, superconductivity, flux, fluxon, vortex, mgb2

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