Uniaxial-Pressure induced Ferromagnetism of Enhanced Paramagnetic Sr3Ru2O7

TL;DR

Applying small uniaxial pressure to Sr3Ru2O7 induces a significant ferromagnetic transition below 80 K, revealing pressure-tunable magnetism linked to structural octahedral rotations.

Contribution

This study demonstrates that uniaxial pressure can induce ferromagnetism in Sr3Ru2O7, a material previously known for paramagnetism, highlighting a new method to control magnetic states.

Findings

Ferromagnetic order appears below 80 K under >0.1 GPa pressure.

Magnetization increases by 100 times at 2 K under pressure.

First order transition indicated by pressure dependence of T_C.

Abstract

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.