Uniaxial-Pressure Induced Ferromagnetism of Enhanced Paramagnetic Sr₃Ru₂O₇

抄録

We report a uniaxial pressure-dependence of magnetism in layered perovskite strontium ruthenate Sr₃Ru₂O₇. By applying a relatively small uniaxial pressure, greater than 0.1 GPa normal to the RuO₂ layer, ferromagnetic ordering manifests below 80 K from the enhanced-paramagnet. Magnetization at 1 kOe and 2 K becomes 100 times larger than that under ambient condition. Uniaxial pressure dependence of Curie temperature T_C suggests the first order magnetic transition. Origin of this uniaxial-pressure induced ferromagnetism is discussed in terms of the rotation of RuO₆ octahedra within the RuO₂ plane.