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

Abstract

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.

6 pages, 5 figures

References in corpus (14)

• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Evidence for two superconducting energy gaps in MgB2 by point-contact spectroscopy
• Specific Heat of Mg ^{11}B_2
• First-Principles Calculation of the Superconducting Transition in MgB2 within the Anisotropic Eliashberg Formalism
• Temperature and field dependence of the anisotropy of MgB2
• Mixed state properties of superconducting MgB2 single crystals
• Anisotropic superconducting properties of MgB2 single crystals probed by in-plane electrical transport measurements
• Superconducting properties of well-shaped MgB2 single crystal
• Temperature dependence and anisotropy of the bulk upper critical field H_c2 of MgB_2
• Peak effect in single crystal MgB${}_2$ superconductor for $\mathbf{H}\parallel c$-axis
• Upper critical field in {Ba${}_{1-x}$K${}_x$BiO${}_3$}: magnetotransport versus magnetotunneling
• Specific heat and disorder in the mixed state of non-magnetic borocarbides
• Anomalous magnetic field dependence of the thermodynamic transition line in the isotropic superconductor (K,Ba)Bi03
• Fluctuation Study of the Specific Heat of MgB2

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