Study of the Magnetoelectric Coupling in the Fe-based Double-perovskite YBaCuFeO₅

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　The double-layered perovskite YBaCuFeO₅ undergoes a commensurate to incommensurate magnetic transition at about T_N2~175 K. Distinguishing the contributions of both Fe³⁺/Cu²⁺ to the magnetic structures is crucial for the further understanding of the magnetoelectric coupling and the physical properties of YBCFO. Using RIXS on BL12XU, we observed an excitation peak at the pre-edge of Fe K-edge at room temperature.