Local studies of the ferromagnetic ordering temperature suppression in SrRuO3

TL;DR

This study investigates how structural disorder and vacancies in SrRuO3 affect its ferromagnetic ordering temperature using local NMR and complementary techniques, revealing that high-pressure oxygen annealing reduces the magnetic transition temperature.

Contribution

It provides new insights into the local structural factors influencing ferromagnetic suppression in SrRuO3 through combined NMR, diffraction, and XAFS analyses.

Findings

High-pressure oxygen annealing introduces structural disorder.

Vacancies on Ru sites are observed in high-pressure samples.

The magnetic ordering temperature is reduced in high-pressure samples.

Abstract

In order to gain insight into suppression of the ferromagnetic ordering temperature, local studies utilizing 99,101Ru zero-field spin-echo NMR, along with complimentary magnetization, high-angle x-ray diffraction, and Ru K-edge XAFS measurements, have been carried out on samples of SrRuO3 annealed at both "ambient" (atmospheric) pressure and "high-pressure" oxygen (600 atm). For the "high pressure" sample, the results indicate structural disorder and the existence of some vacancies on the Ru sites, along with a reduced magnetic ordering temperature.