Abstract
We report the angle-resolved magnetotransport measurements on ${\mathrm{MgB}}_{2}$ single crystals that exhibit moderate anisotropy (\ensuremath{\gamma}) in upper critical fields with $\ensuremath{\gamma}=2.6\ifmmode\pm\else\textpm\fi{}0.1.$ Unusual ``kink'' features in resistivity are observed, which appear most clearly for field parallel to the c axis. We discuss the origin of the ``kink'' features in relation with the vortex-lattice melting and the recently proposed model of two-gap superconductivity. The influences of anisotropy on superconducting properties including the kink features are also demonstrated.
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