Origin of magnetic excitation gap in double perovskite Sr2FeOsO6

Taylor, Alice E.; Morrow, Ryan; Lumsden, Mark D.; Calder, Stuart A.; Upton, M. H.; Kolesnikov, Alexander I.; Stone, Matthew B.; Fishman, Randy Scott; Paramekanti, A.; Woodward, Patrick M.; Christianson, Andrew D.

doi:10.1103/PhysRevB.98.214422

Title: Origin of magnetic excitation gap in double perovskite ${Sr}_{2} {FeOsO}_{6}$

Journal Article · Wed Dec 12 00:00:00 EST 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.214422· OSTI ID:1489595

^[1]; Morrow, Ryan ^[2];

^[1];

^[1]; Upton, M. H. ^[3];

^[1];

^[1]; Paramekanti, A. ^[4]; Woodward, Patrick M. ^[5];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
The Ohio State Univ., Columbus, OH (United States); Leibniz Institute for Solid State and Materials Research Dresden IFW, Dresden (Germany)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Toronto, Toronto, ON (Canada); Canadian Institute for Advanced Research, Toronto, ON (Canada)
The Ohio State Univ., Columbus, OH (United States)

Sr₂FeOsO₆ is an insulating double perovskite compound which undergoes antiferromagnetic transitions at 140 (T_N1) and 67 K (T_N2). 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 T_N1, however below T_N2 a gap of 6.8 meV develops. The RIXS data reveals splitting of the T_2g multiplet consistent with that seen in other 5d³ osmium based double perovskites. Altogether these results suggest that spin-orbit coupling is important for ground state selection in 3d–5d³ double perovskite materials.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Alexander von Humboldt Foundation; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

OSTI ID:: 1489595

Alternate ID(s):: OSTI ID: 1485528; OSTI ID: 1488380

Journal Information:: Physical Review B, Vol. 98, Issue 21; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Title: Origin of magnetic excitation gap in double perovskite ${Sr}_{2} {FeOsO}_{6}$