Abstract
Sr2FeOsO6 is an insulating double perovskite compound which undergoes antiferromagnetic transitions at 140 (TN1) and 67 K (TN2). To study the underlying electronic and magnetic interactions giving rise to this behavior we have performed inelastic neutron scattering (INS) and resonant inelastic x-ray scattering (RIXS) experiments on polycrystalline samples of Sr2FeOsO6. The INS data reveal that the spectrum of spin excitations remains ungapped below TN1, however below TN2 a gap of 6.8 meV develops. The RIXS data reveals splitting of the T2g multiplet consistent with that seen in other 5d3 osmium based double perovskites. Together these results suggest that spin-orbit coupling is important for ground state selection in 3d-5d3 double perovskite materials.
Original language | English |
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Article number | 214422 |
Journal | Physical Review B |
Volume | 98 |
Issue number | 21 |
DOIs | |
State | Published - Dec 12 2018 |
Funding
This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The research at ORNL's Spallation Neutron Source and High Flux Isotope Reactor was supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy (DOE). Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. This research was supported in part by the Center for Emergent Materials a National Science Foundation (NSF) Materials Research Science and Engineering Center (DMR-1420451). R.M. acknowledges support from the Alexander von Humboldt Foundation. A.P. acknowledges funding from NSERC of Canada.