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The double-perovskite A$_2$BB'O$_6$ with heavy transition metal ions on theordered B' sites is an important family of compounds to study the interplaybetween electron correlation and spin-orbit coupling (SOC). Here we preparedhigh-quality Sr$_2$MgReO$_6$ powder and single-crystal samples and performednon-resonant and resonant synchrotron x-ray diffraction experiments toinvestigate its magnetic ground state. By combining the magnetic susceptibilityand heat capacity measurements, we conclude that Sr$_2$MgReO$_6$ exhibits alayered antiferromagnetic (AF) order at temperatures below $\sim$ 55 K with apropagation vector q = (001), which contrasts the previously suspected spinglass state. Our works clarify the magnetic order in Sr$_2$MgReO$_6$ anddemonstrate it as a candidate system to look for magnetic octupolar orders andexotic spin dynamics.

Antiferromagnetic long-range order in $5d^1$ double-perovskite Sr$_2$MgReO$_6$