Irreversibility line of the MgB₂ superconductor
Zhang, Y. Z. · Deltour, R. · Wen, H. H. · de Marneffe, J. F. · Chen, H. · Wang, S. F. · Dai, S. Y. · Zhou, Y. L. · Li, Q. · Jansen, A. G. M. · Wyder, P. · Zhao, Z. X.
Original · EN
Magneto-resistivity of a c-axis oriented MgB₂ thin film was studied in perpendicular and parallel magnetic fields up to 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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