uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Heavy-mass magnetic modes in pyrochlore iridates due to dominant Dzyaloshinskii-Moriya interaction
IFW Dresden, Inst Theoret Solid State Phys, Helmholtzstr 20, D-01069 Dresden, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
IFW Dresden, Inst Theoret Solid State Phys, Helmholtzstr 20, D-01069 Dresden, Germany;Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany.
IFW Dresden, Inst Theoret Solid State Phys, Helmholtzstr 20, D-01069 Dresden, Germany.
Show others and affiliations
2018 (English)In: PHYSICAL REVIEW MATERIALS, ISSN 2475-9953, Vol. 2, no 7, article id 074408Article in journal (Refereed) Published
Abstract [en]

Materials with strong spin-orbit interactions are presently a main target in the search for systems with novel magnetic properties. Magnetic anisotropies can be very large in such compounds, ranging from strongly frustrated Kitaev exchange and the associated spin-liquid states in honeycomb iridates to robust antisymmetric couplings in square-lattice Sr2IrO4. Here we predict from ab initio quantum chemistry calculations that another highly unusual regime is realized in pyrochlore iridium oxides: the isotropic nearest-neighbor Heisenberg term can vanish while the antisymmetric Dzyaloshinskii-Moriya interaction reaches values as large as 5 meV, a result which challenges common notions and existing phenomenological models of magnetic superexchange. The resulting spin-excitation spectra reveal a very flat magnon dispersion in the Nd- and Tb-based pyrochlore iridates, suggesting the possibility of using these modes to store magnetic information. Indeed, the magnetization dynamics indicates that these modes are unable to propagate out of the excitation region. Although most of the results presented here are predictions of exotic magnetic states based on first-principles theory, we make connections to observations and establish the accuracy of our approach by reproducing experimental data for Sm2Ir2O4.

Place, publisher, year, edition, pages
2018. Vol. 2, no 7, article id 074408
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-361999DOI: 10.1103/PhysRevMaterials.2.074408ISI: 000439987600002OAI: oai:DiVA.org:uu-361999DiVA, id: diva2:1253946
Funder
Knut and Alice Wallenberg Foundation, 2013.0020Knut and Alice Wallenberg Foundation, 2012.0031Swedish Research CouncileSSENCE - An eScience CollaborationGerman Research Foundation (DFG), SFB-1143 HO-4427/2Available from: 2018-10-08 Created: 2018-10-08 Last updated: 2018-10-08Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full text

Authority records BETA

Pereiro, ManuelBergman, Anders

Search in DiVA

By author/editor
Pereiro, ManuelBergman, Anders
By organisation
Materials Theory
Condensed Matter Physics

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 15 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf