When the effective size of a superconductor falls below its characteristic length scales, such as the London penetration depth λ(T) or the coherence length ξ(T), alterations in its superconducting properties are anticipated. It becomes compelling to explore how these superconducting properties change at these lengths. The data of MgB2 type-II metallic superconductor is investigated with grain sizes ranging between 30-80 nm which are considered to be sizes that range that are comparable to the coherence length of MgB2 (~40 nm).

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