Anisotropy of the Upper Critical Field and Critical Current in Single Crystal MgB$_2$

Details Anisotropy of the Upper Critical Field and Critical Current in Single Crystal MgB$_2$ Anisotropy of the Upper Critical Field and Critical Current in Single Crystal MgB$_2$

2002-06-13

arxiv.org/abs/cond-mat/0206231v2

Phys. Rev. B 66 (2002), 180502 (R)

Physics

Condensed Matter

Superconductivity

6 pages, 5 figures

Scientific paper

10.1103/PhysRevB.66.180502

We report on specific heat, high magnetic field transport and $ac-$susceptibility measurements on magnesium diboride single crystals. The upper critical field $H_{c2}$ 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 $\Gamma \sim$ 5 at low temperatures and about 2 near $T_c$. A peak effect is observed in susceptibility measurements for $H \sim $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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