Spin-wave excitations in the ferromagnetic metallic and in the charge-, orbital-, and spin-ordered states in Nd1-xSrxMnO3 with x approximate to 0.5

H. Ulbrich, Frank Kruger, A. A. Nugroho, D. Lamago, Y. Sidis, M. Braden

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

We report inelastic neutron-scattering experiments on single crystals of Nd1-xSrxMnO3 with x = 0.5 and x = 0.49. The spin-wave dispersion in the charge-, orbital-, and spin-ordered state in Nd0.5Sr0.5MnO3 exhibits a strongly anisotropic stiffness. The sign of the anisotropy is characteristic for the site-centered model for charge and orbital ordering in half doped manganites. Within this model, linear spin-wave theory yields a perfect description of the experimental dispersion. In the ferromagnetic metallic state of Nd1-xSrxMnO3 with x = 0.49 and x = 0.50 magnetic excitations exhibit nearly the same magnon dispersion. High intense signals near the zone boundary over a wide energy level overlap with a sharp spin-wave dispersion, which can be described with a Heisenberg model including nearest-neighbor interactions.

Original languageEnglish
Pages (from-to)094453
Number of pages12
JournalPhysical Review. B, Condensed matter and materials physics
Volume84
Issue number9
DOIs
Publication statusPublished - 28 Sept 2011

Keywords

  • COLOSSAL MAGNETORESISTIVE MANGANITES
  • HALF-DOPED MANGANITES
  • JAHN-TELLER PHONONS
  • MAGNETIC ORDER
  • A-TYPE
  • TRANSITION
  • LA0.5SR1.5MNO4
  • DIFFRACTION
  • DYNAMICS
  • LAMNO3

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