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Zusammenfassung:
We present the results of zero-field muon-spin relaxation measurements
made on the double perovskite insulators Sr2BOsO6 (B = Fe, Y, In).
Spontaneous muon-spin precession indicative of quasistatic long range
magnetic ordering is observed in Sr2FeOsO6 within the AF1
antiferromagnetic phase for temperatures below T-N = 135 +/- 2 K. Upon
cooling below T-2 approximate to 67 K the oscillations cease to be
resolvable owing to the coexistence of the AF1 and AF2 phases, which
leads to a broader range of internal magnetic fields. Using density
functional calculations we identify a candidate muon stopping site
within the unit cell, which dipole field simulations show to be
consistent with the proposed magnetic structure. The possibility of
incommensurate magnetic ordering is discussed for temperatures below T-N
= 53 K and 25 K for Sr2YOsO6 and Sr2InOsO6, respectively.
