Complex magnetic structures of a Shastry-Sutherland lattice TmB 4 studied by powder neutron diffraction analysis

Shinji Michimura, Akira Shigekawa, Fumitoshi Iga, Toshiro Takabatake, Kenji Ohoyama

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21 Citations (Scopus)

Abstract

Powder neutron diffraction analysis was performed on Tm 11B 4, which undergoes successive transitions at T N1 = 11.7 K, T* = 11 K, and T N2 = 10 K. An incommensurate structure with two propagation vectors, k 2 = [1 ± k′ ± k″, ±k″; 0] and k 2′ = [1 ± k′ ± 3k″, ±k″; 0] (k′ = 0.1226 and k″ ≃ 0.012), is suggested for phase II (T* ≤ T ≤ T N1). Phase III (T N2 ≤ T ≤ T*) is described by one propagation vector, k 3 = [1 ± k′, 0, 0]. The propagation vector for phase IV (T ≤ T N2) further changes to a commensurate one characterized by k 4 = [100]. Four Tm moments in the c-plane order in a (+-+--) type, where + and -- mean the directions of the moments parallel and antiparallel to the c-direction, respectively. The diffuse scattering intensity around the (100) magnetic reflection remains above T N2 up to 20 K.

Original languageEnglish
Article number024707
Journaljournal of the physical society of japan
Volume78
Issue number2
DOIs
Publication statusPublished - 2009 Feb

Keywords

  • Frustration
  • Magnetic structure
  • Neutron powder diffraction
  • Shastry-Sutherland lattice
  • TmB

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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