Complex Magnetic Structures of a Shastry–Sutherland Lattice TmB<SUB>4</SUB> Studied by Powder Neutron Diffraction Analysis

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  • Michimura Shinji
    Department of Quantum Matter, ADSM, Hiroshima University
  • Shigekawa Akira
    Department of Quantum Matter, ADSM, Hiroshima University
  • Iga Fumitoshi
    Department of Quantum Matter, ADSM, Hiroshima University
  • Takabatake Toshiro
    Department of Quantum Matter, ADSM, Hiroshima University Institute for Advanced Materials Research, Hiroshima University
  • Ohoyama Kenji
    Institute for Materials Research, Tohoku University

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  • Complex magnetic structures of a Shastry-Sutherland lattice TmB4 studied by powder neutron diffraction analysis

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Powder neutron diffraction analysis was performed on Tm11B4, which undergoes successive transitions at TN1=11.7 K, T*=11 K, and TN2=10 K. An incommensurate structure with two propagation vectors, k2=[1±k′±k″,±k″,0] and k2′=[1±k′±3k″,±k″,0] (k′=0.1226 and k″\\simeq0.012), is suggested for phase II (T*≤T≤TN1). Phase III (TN2≤T≤T*) is described by one propagation vector, k3=[1±k′,0,0]. The propagation vector for phase IV (T≤TN2) further changes to a commensurate one characterized by k4=[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 TN2 up to 20 K.

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