Abstract
Using magnetization, transport and single-crystal specific heat measurements we have determined the superconducting phase diagram of MgB 2. A zero-temperature in-plane coherence length of 9.4 nm is found. The superconducting anisotropy γ changes monotonously from a value around 2 near T c to above 4.5 near 22 K. We present strong 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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