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The magnetic ground state of double perovskite Sr2DyRuO6 has beeninvestigated using muon spin rotation and relaxation (muSR), neutron powderdiffraction (NPD) and inelastic neutron scattering (INS), in addition to heatcapacity and magnetic susceptibility (ac and dc) measurements. A clearsignature of a long-range ordered magnetic ground state has been observed inthe heat capacity data, which exhibit two sharp anomalies at 39.5 and 36 Kfound as well in the magnetic data. Further confirmation of long-range magneticordering comes from a sharp drop in the muon initial asymmetry and a peak inthe relaxation rate at 40 K, along with a weak anomaly near 36 K. Based ontemperature dependent NPD, the low temperature magnetic structure contains twointerpenetrating lattices of Dy and Ru5, forming an antiferromagnetic groundstate below 39.5 K with magnetic propagation vector k = (0,0,0). The magneticmoments of Dy and Ru at 3.5 K are pointing along the crystallographic b-axiswith values of muDy = 4.92(10) muB and muRu = 1.94(7) muB, respectively. Thetemperature dependence of the Ru moments follows a mean field type behaviour,while that of the Dy moments exhibits a deviation indicating that the primarymagnetic ordering is induced by the order of the 4d electrons of Ru rather thanthat of its proper 4f Dy electrons. The origin of the second anomaly observedin the heat capacity data at 36.5 K must be connected to a very small spinreorientation as the NPD studies do not reveal any clear change in the observedmagnetic Bragg peaks positions or intensities between these two transitions.INS measurements reveal the presence of crystal field excitations (CEF) in theparamagnetic state with overall CEF splitting of 73.8 meV, in agreement withthe point change model calculations.

Muon spin rotation and neutron scattering investigations of the B-site ordered double perovskite Sr2DyRuO6