The double-perovskite A2BB'O6 with heavy transition metal ions on the ordered B' sites is an important family of compounds to study the interplay between electron correlation and spin-orbit coupling (SOC). Here we prepared high-quality Sr2MgReO6 powder and single-crystal samples and performed non-resonant and resonant synchrotron x-ray diffraction experiments to investigate its magnetic ground state. By combining the magnetic susceptibility and heat capacity measurements, we conclude that Sr2MgReO6 exhibits a layered antiferromagnetic (AF) order at temperatures below ∼ 55 K with a propagation vector q = (001), which contrasts the previously suspected spin glass state. Our works clarify the magnetic order in Sr2MgReO6 and demonstrate it as a candidate system to look for magnetic octupolar orders and exotic spin dynamics.
@article{arxiv.2006.08865,
title = {Antiferromagnetic long-range order in $5d^1$ double-perovskite Sr$_2$MgReO$_6$},
author = {Shang Gao and Daigorou Hirai and Hajime Sagayama and Hiroyuki Ohsumi and Zenji Hiroi and Taka-hisa Arima},
journal= {arXiv preprint arXiv:2006.08865},
year = {2020}
}