#### Abstract

Detailed magnetotransport data on dense wires of ${\mathrm{MgB}}_{2}$ are reported for applied magnetic fields up to 18 T. The temperature and field dependencies of the electrical resistivity are consistent with ${\mathrm{MgB}}_{2}$ behaving like a simple metal and following a generalized form of Kohler’s rule. In addition, given the generally higher-${T}_{c}$ values and narrower resistive transition widths associated with ${\mathrm{MgB}}_{2}$ synthesized in this manner, combined with applied magnetic fields of up to 18 T, an accurate and complete ${H}_{c2\mathrm{}}\mathrm{}\left(T\right)\mathrm{}$ curve could be determined. This curve agrees well with curves determined from lower field measurements on sintered pellets and wires of ${\mathrm{MgB}}_{2}.$ ${H}_{c2\mathrm{}}\mathrm{}\left(T\right)\mathrm{}$ is linear in *T* over a wide range of temperature $(7\mathrm{}\mathrm{K}<~T<~32\mathrm{K})$ and has an upward curvature for *T* close to ${T}_{c}.$ These features are similar to other high κ, clean limit, boron-bearing intermetallics: ${\mathrm{YNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}$ and ${\mathrm{LuNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}.$

DOI: http://dx.doi.org/10.1103/PhysRevB.63.220503

- Received 22 February 2001
- Published 11 May 2001

© 2001 The American Physical Society