## Abstract

Powder neutron diffraction analysis was performed on Tm ^{11}B _{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 language | English |
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Article number | 024707 |

Journal | journal of the physical society of japan |

Volume | 78 |

Issue number | 2 |

DOIs | |

Publication status | Published - 2009 Feb |

Externally published | Yes |

## Keywords

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

## ASJC Scopus subject areas

- Physics and Astronomy(all)

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