Irreversibility line of the MgB₂ superconductor

2001/10/16 by Y. Z. Zhang, R. Deltour, Zhang, Y. Z. +21
Physics and Astronomy · #FOS: Physical sciences #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.cond-mat/0110312

: 11 pages, revtex4, 4 figs embedded

arxiv created 2002/03/05 · arxiv updated 2009/11/30

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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