Uniaxial-Pressure induced Ferromagnetism of Enhanced Paramagnetic   Sr3Ru2O7
  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. 
Shin-Ichi Ikeda, Naoki Shirakawa, Takashi Yanagisawa, Yoshiyuki   Yoshida, Shigeru Koikegami, Soh Koike, Masashi Kosaka, and...