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Low-energy magnons in the chiral ferrimagnet Cu2OSeO3: A coarse-grained approach.
Luo, Yi; Marcus, G G; Trump, B A; Kindervater, J; Stone, M B; Rodriguez-Rivera, J A; Qiu, Yiming; McQueen, T M; Tchernyshyov, O; Broholm, C.
Affiliation
  • Luo Y; Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
  • Marcus GG; Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
  • Trump BA; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA.
  • Kindervater J; Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
  • Stone MB; Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Rodriguez-Rivera JA; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA.
  • Qiu Y; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA.
  • McQueen TM; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA.
  • Tchernyshyov O; Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
  • Broholm C; Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Phys Rev B ; 1012020.
Article in En | MEDLINE | ID: mdl-33655091
ABSTRACT
We report a comprehensive neutron scattering study of low energy magnetic excitations in the breathing pyrochlore helimagnetic Cu2OSeO3. Fully documenting the four lowest energy magnetic modes that leave the ferrimagnetic configuration of the "strong tetrahedra" intact ( | ℏ ω | < 13 meV), we find gapless quadratic dispersion at the point for energies above 0.2 meV, two doublets separated by 1.6(2) meV at the R point, and a bounded continuum at the X point. Our constrained rigid spin cluster model relates these features to Dzyaloshinskii-Moriya (DM) interactions and the incommensurate helical ground state. Combining conventional spin wave theory with a spin cluster form factor accurately reproduces the measured equal time structure factor through multiple Brillouin zones. An effective spin Hamiltonian describing complex anisotropic intercluster interactions is obtained.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Phys Rev B Year: 2020 Document type: Article Affiliation country: Estados Unidos
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Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Phys Rev B Year: 2020 Document type: Article Affiliation country: Estados Unidos