Irreversibility line of the MgB2 superconductor
Y. Z. Zhang, R. Deltour, H. H. Wen, J. F. de Marneffe, H. Chen, S. F. Wang, S. Y. Dai, Y. L. Zhou, Q. Li, A. G. M. Jansen, P. Wyder, Z. X. Zhao
Abstract
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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