Irreversibility line of the MgB$_{2}$ superconductor

Details Irreversibility line of the MgB$_{2}$ superconductor Irreversibility line of the MgB$_{2}$ superconductor

2001-10-16

arxiv.org/abs/cond-mat/0110312v4

Physics

Condensed Matter

Superconductivity

: 11 pages, revtex4, 4 figs embedded

Scientific paper

Magneto-resistivity of a c-axis oriented MgB$_{2}$ thin film was studied in perpendicular and parallel magnetic fields up to $\sim $23 T with temperatures down to 0.38 K. Resistive critical magnetic fields were determined. Large separations between irreversibility lines and upper critical magnetic fields are observed. An effective quantum parameter as a function of temperature is proposed to explain the separations under the theoretical framework of quantum fluctuations, in good agreement with our experimental and previously published experimental data.

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