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We present the results of zero-field muon-spin relaxation measurements madeon the double perovskite insulators Sr$_{2}B$OsO$_6$ ($B={\rm Fe, Y, In}$).Spontaneous muon-spin precession indicative of quasistatic long range magneticordering is observed in Sr$_{2}$FeOsO$_6$ within the AF1 antiferromagneticphase for temperatures below $T_{\rm N}=135 \pm 2~{\rm K}$. Upon cooling below$T_2 \approx 67~{\rm K}$ the oscillations cease to be resolvable owing to thecoexistence of the AF1 and AF2 phases, which leads to a broader range ofinternal magnetic fields. Using density functional calculations we identify acandidate muon stopping site within the unit cell, which dipole fieldsimulations show to be consistent with the proposed magnetic structure. Thepossibility of incommensurate magnetic ordering is discussed for temperaturesbelow $T_{\rm N}=53~{\rm K}$ and 25~K for Sr$_{2}$YOsO$_6$ andSr$_{2}$InOsO$_6$, respectively.

Muon-spin relaxation study of the double perovskite insulators Sr$_{2}B$OsO$_6$ ($B={\rm Fe, Y, In}$)