Ferromagnetism Induced by Uniaxial Pressure in the Itinerant Metamagnet Sr3Ru2O7

TL;DR

This study demonstrates that applying uniaxial pressure along the c-axis of Sr3Ru2O7 induces ferromagnetism at around 80 K, revealing pressure as a tuning parameter for magnetic states in this material.

Contribution

It provides new experimental evidence that uniaxial pressure can induce ferromagnetism in Sr3Ru2O7, with a higher critical pressure than previously reported, highlighting the role of impurity levels.

Findings

Uniaxial pressure along c-axis induces ferromagnetism at ~80 K.

Critical pressure for ferromagnetism is about 4 kbar or higher.

Pressure perpendicular to c-axis shifts metamagnetic field to higher fields.

Abstract

We report a uniaxial-pressure study on the magnetisation of single crystals of the bilayer perovskite Sr3Ru2O7, a metamagnet close to a ferromagnetic instability. We observed that the application of a uniaxial pressure parallel to the c-axis induces ferromagnetic ordering with a Curie temperature of about 80 K and critical pressures of about 4 kbar or higher. This value for the critical pressure is even higher than the value previously reported (~ 1 kbar), which might be attributed to the difference of the impurity level. Below the critical pressure parallel to the c-axis, the metamagnetic field appears to hardly change. We have also found that uniaxial pressures perpendicular to the c-axis, in contrast, do not induce ferromagnetism, but shift the metamagnetic field to higher fields.