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Pressure versus Concentration Tuning of the Superconductivity in Ba(Fe<sub>1-<i>x</i></sub>Co<sub><i>x</i></sub>)<sub>2</sub>As<sub>2</sub>
In the iron arsenide compound BaFe2As2, superconductivity can be induced either by a variation of its chemical composition, e.g., by replacing Fe with Co, or by a reduction of the unit-cell volume through the application of hydrostatic pressure p. In contrast to chemical substitutions, pressure is expected to introduce no …