Temperature dependent bilayer ferromagnetism in Sr3Ru2O7

TL;DR

This study uses inelastic neutron scattering to investigate temperature-dependent ferromagnetic fluctuations in Sr3Ru2O7, revealing persistent magnetic behavior up to 100 K, likely linked to its proximity to a magnetic transition.

Contribution

It provides detailed experimental insights into the temperature evolution of ferromagnetic fluctuations in Sr3Ru2O7, highlighting their persistence at unexpectedly high temperatures.

Findings

Ferromagnetic fluctuations observed from 3.8 K to 100 K

Magnetic response detected between 2 and 14 meV energy transfer

Fluctuations linked to proximity to metamagnetic transition

Abstract

The Ruthenium based perovskites exhibit a wide variety of interesting collective phenomena related to magnetism originating from the Ru 4d electrons. Much remains unknown concerning the nature of magnetic fluctuations and excitations in these systems. We present results of detailed inelastic neutron scattering measurements of Sr3Ru2O7 as a function of temperature, probing the ferromagnetic fluctuations of the bilayer structure. A magnetic response is clearly visible for a range of temperatures, T = 3.8 K up to T = 100 K, and for energy transfers between 2 and 14 meV. These measurements indicate that the ferromagnetic fluctuations manifest in the bilayer structure factor persist to surprisingly large temperatures. This behavior may be related to the proximity of the system in zero magnetic field to the metamagnetic/ferromagnetic transition.