Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102105
Title: Magnon dispersion in Ca2Ru1-xTix O4: Impact of spin-orbit coupling and oxygen moments
Authors: Kunkemöller, S.
Komleva, E.
Streltsov, S. V.
Hoffmann, S.
Khomskii, D. I.
Steffens, P.
Sidis, Y.
Schmalzl, K.
Braden, M.
Issue Date: 2017
Publisher: American Physical Society
Citation: Magnon dispersion in Ca2Ru1-xTix O4: Impact of spin-orbit coupling and oxygen moments / S. Kunkemöller, E. Komleva, S. V. Streltsov, et al. — DOI 10.1103/PhysRevB.95.214408 // Physical Review B. — 2017. — Vol. 95. — Iss. 21. — 214408.
Abstract: The magnon dispersion of Ca2RuO4 has been studied by polarized and unpolarized neutron scattering experiments on crystals containing 0, 1, and 10% of Ti. Ti is inserted in order to enable the growth of large, partially detwinned crystals. One percent of Ti has a negligible impact on structural and magnetic properties. Also for 10% Ti content magnetic properties still change very little, but the insulating phase is stabilized up to at least 700 K and structural distortions are reduced. The full dispersion of transverse magnons studied for 1% Ti substitution can be well described by a conventional spin-wave model with interaction and anisotropy parameters that agree with density functional theory calculations. Spin-orbit coupling strongly influences the magnetic excitations, as it is most visible in large energies of the magnetic zone-center modes arising from magnetic anisotropy. Additional modes appear at low energy near the antiferromagnetic zone center and can be explained by a sizable magnetic moment of 0.11 Bohr magnetons, which the density functional theory calculations find located on the apical oxygens. The energy and the signal strength of the additional branch are well described by taking into account this oxygen moment with weak ferromagnetic coupling to the Ru moments. © 2017 American Physical Society.
Keywords: DATA COMMUNICATION EQUIPMENT
DISPERSION (WAVES)
MAGNETIC ANISOTROPY
MAGNETIC MOMENTS
NEUTRON SCATTERING
OXYGEN
SPIN WAVES
TERNARY ALLOYS
TITANIUM
TITANIUM ALLOYS
ANISOTROPY PARAMETERS
ANTIFERROMAGNETICS
FERROMAGNETIC COUPLING
MAGNETIC EXCITATIONS
NEUTRON SCATTERING EXPERIMENTS
SPIN-ORBIT COUPLINGS
STRUCTURAL AND MAGNETIC PROPERTIES
STRUCTURAL DISTORTIONS
DENSITY FUNCTIONAL THEORY
URI: http://hdl.handle.net/10995/102105
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85023639096
PURE ID: 1925010
ISSN: 24699950
DOI: 10.1103/PhysRevB.95.214408
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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