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Superconductivity in undoped single crystals of BaFe<sub>2</sub>As<sub>2</sub>: field and current dependence
In previous work on undoped MFe(2)As(2), partial drops in the resistivity indicative of traces of superconductivity have been observed for some samples with M = Ba (T(c)∼20 K, up to 25% drop in ρ) and M = Ca (T(c)∼10 K, up to 45% drop in ρ). A complete drop in …