The pair-breaking critical current density of magnesium diboride
Kunchur, Milind N. · Lee, Sung-Ik · Kang, W. N.
Original · EN
The pair-breaking critical current density jd 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 ΔTC(j)/TC(0) ∝ -[j/jd(0)]²/³ manner, with a projected jd(0) ≈ 2 × 10⁷ A/cm². The directly measured jd(0), from current-voltage (I-V)curves at different fixed temperatures, has a similar value and the overall temperature dependence jd(T) and magnitude are consistent with Ginzburg-Landau theory. Keywords: pair, breaking, depairing, superconductor, superconductivity, flux, fluxon, vortex, mgb2
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