Abstract
The superconducting phase diagram of single-crystal MgB 2 has been determined using magnetization, magneto-transport and specific heat measurements. A value of 9.4 nm is found for the zero-temperature in-plane coherence length. The superconducting anisotropy coefficient, γ, increases monotonously from a value around 2 near T c to 4.5 at low temperature. The current dependence and angular dependence of the resistive transitions give evidence for a surface superconducting state for H∥ c which might account for the wide spread in reported values of the superconducting anisotropy.
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