Room temperature multiferroicity in orthorhombic LuFeO${}_3$

From the measurement of dielectric, ferroelectric, and magnetic properties we observe simultaneous ferroelectric and magnetic transitions around $\sim$600 K in orthorhombic LuFeO${}_3$. We also observe suppression of the remanent polarization by $\sim$95% under a magnetic field of $\sim$15 kOe at room temperature. The extent of suppression of the polarization under magnetic field increases monotonically with the field. These results show that even the orthorhombic LuFeO${}_3$ is a room temperature multiferroic of type-II variety exhibiting quite a strong coupling between magnetization and polarization.