Anisotropy of the Upper Critical Field and Critical Current in Single Crystal MgB₂
Lyard, L. · Samuely, P. · Szabo, P. · Klein, T. · Marcenat, C. · Paulius, L. · Kim, K. H. P. · Jung, C. U. · Lee, H. -S. · Kang, B. · Choi, S. · Lee, S. -I. · Marcus, J. · Blanchard, S. · Jansen, A. G. M. · Welp, U. · Karapetrov, G. · Kwok, W. K.
Original · EN
We report on specific heat, high magnetic field transport and ac-susceptibility measurements on magnesium diboride single crystals. The upper critical field Hc₂ for magnetic fields perpendicular and parallel to the Mg and B planes is presented for the first time in the entire temperature range. A very different temperature dependence has been observed in the two directions which yields to a temperature dependent anisotropy with Γ 5 at low temperatures and about 2 near Tc. A peak effect is observed in susceptibility measurements for H 2 T parallel to the c-axis and the critical current density presnts a sharp maximum for H parallel to the ab-plane.
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