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We report comprehensive high pressure studies on correlation betweenintercalated magnetic layers and superconductivity in EuFe2(As0.81P0.19)2single crystal through in-situ high pressure resistance, specific heat, X-raydiffraction and X-ray absorption measurements. We find that an unconfirmedmagnetic order of the intercalated layers coexists with superconductivity in anarrow pressure range 0-0.5GPa, and then it converts to a ferromagnetic (FM)order at pressure above 0.5 GPa, where its superconductivity is absent. Theobtained temperature-pressure phase diagram clearly demonstrates that theunconfirmed magnetic order can emerge from the superconducting state. In starkcontrast, the superconductivity cannot develop from the FM state that isevolved from the unconfirmed magnetic state. High pressure X-ray absorption(XAS) measurements reveal that the pressure-induced enhancement of Eu's meanvalence plays an important role in suppressing the superconductivity and tuningthe transition from the unconfirmed magnetic state to a FM state. The unusualinterplay among valence state of Eu ions, magnetism and superconductivity underpressure may shed new light on understanding the role of the intercalatedmagnetic layers in Fe-based superconductors.

Correlation between intercalated magnetic layers and superconductivity in pressurized EuFe2(As0.81P0.19)2