Magnetoresistivity and Complete $H_{c2}(T)$ in $Mg{B}_2$

Abstract

Detailed magneto-transport data on dense wires of $Mg{B}_2$ are reported for applied magnetic fields up to 18 T. The temperature and field dependencies of the electrical resistivity are consistent with $Mg{B}_2$ behaving like a simple metal and following a generalized form of Kohler's rule. In addition, given the generally high $T_c$ values and narrow resistive transition widths associated with $Mg{B}_2$ synthesized in this manner, combined with applied magnetic fields of up to 18 T, an accurate and complete $H_{c2}(T)$ curve could be determined. This curve agrees well with curves determined from lower field measurements on sintered pellets and wires of $Mg{B}_2$. $H_{c2}(T)$ is linear in $T$ over a wide range of temperature (7 K $\le T\le$ 32 K) and has an upward curvature for $T$ close to $T_c$. These features are similar to other high $\kappa$, clean limit, boron-bearing intermetallics: $YN{i}_2{B}_{2}C$ and $LuN{i}_2{B}_{2}C$.

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References in corpus (4)

• Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Superconductivity in Dense $Mg{B}_2$ Wires
• Thermodynamic and Transport Properties of Superconducting $M{g}^{10}{B}_2$

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