Origin of magnetic excitation gap in double perovskite Sr2FeOsO6

Taylor, A. E.; Morrow, R.; Lumsden, M. D.; Calder, S.; Upton, M. H.; Kolesnikov, A. I.; Stone, M. B.; Fishman, R. S.; Paramekanti, A.; Woodward, P. M.; Christianson, A. D.

doi:10.1103/PhysRevB.98.214422

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:1488380

Taylor, A. E. ^[1]; Morrow, R. ^[2]; Lumsden, M. D. ^[1]; Calder, S. ^[1]; Upton, M. H. ^[3]; Kolesnikov, A. I. ^[1]; Stone, M. B. ^[1]; Fishman, R. S. ^[1]; Paramekanti, A. ^[4]; Woodward, P. M. ^[5]; Christianson, A. D. ^[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.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: Alexander von Humboldt Foundation; National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

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

OSTI ID:: 1488380

Alternate ID(s):: OSTI ID: 1485528
OSTI ID: 1489595

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

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Octupolar order in d -orbital Mott insulators Paramekanti, A.; Maharaj, D. D.; Gaulin, B. D. Physical Review B, Vol. 101, Issue 5 https://doi.org/10.1103/physrevb.101.054439	journal	February 2020
Octupolar order in d-orbital Mott insulators Paramekanti, Arun; Maharaj, Dalini D.; Gaulin, Bruce D. arXiv https://doi.org/10.48550/arxiv.1909.03089	text	January 2019

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