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Controlling functionalities, such as magnetism or ferroelectricity, by meansof oxygen vacancies (VO) is a key issue for the future development oftransition metal oxides. Progress in this field is currently addressed throughVO variations and their impact on mainly one order parameter. Here we reveal anew mechanism for tuning both magnetism and ferroelectricity simultaneously byusing VO. Combined experimental and density-functional theory studies ofEu0.5Ba0.5TiO3-{\delta}, we demonstrate that oxygen vacancies create Ti3+ 3d1defect states, mediating the ferromagnetic coupling between the localized Eu4f7 spins, and increase an off-center displacement of Ti ions, enhancing theferroelectric Curie temperature. The dual function of Ti sites also promises amagnetoelectric coupling in the Eu0.5Ba0.5TiO3-{\delta}.

Manipulating Multiple Order Parameters via Oxygen Vacancies: The case of Eu0.5Ba0.5TiO3-{\delta}