The double-layered perovskite YBaCuFeO
5 undergoes a commensurate to incommensurate magnetic transition at about T
N2~175 K. Distinguishing the contributions of both Fe
3+/Cu
2+ 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.
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