Spontaneous structural distortion of metallic Shastry-Sutherland system DyB4 by quadrupole-spin-lattice coupling

Abstract

DyB4 has a two-dimensional Shastry-Sutherland (Sh-S) lattice with strong Ising character of the Dy ions. Despite the intrinsic frustrations, surprisingly, it undergoes two successive transitions: a magnetic ordering at TN = 20K, and a quadrupole ordering at TQ=12.5 K. From high-resolution neutron and synchrotron X-ray powder diffraction studies, we have obtained full structural information on this material in all phases, and demonstrate that structural modifications occurring at quadrupolar transition lead to the lifting of frustrations inherent in the Sh-S model. Our study thus provides a complete experimental picture of how the intrinsic frustration of the Sh-S lattice can be lifted by the coupling to quadrupole moments. We show that two other factors, i.e. strong spin-orbit coupling and long-range RKKY interaction in metallic DyB4, play an important role in this behavior.

arXiv comment12 pages, 3 figures Physical Review B, accepted

References in corpus (5)

• Fractional magnetization plateaus and magnetic order in the Shastry Sutherland magnet TmB4
• Observation of Modulated Quadrupolar Structures in PrPb3
• Geometrical quadrupolar frustration in DyB${}_4$
• Spin Liquids and Antiferromagnetic Order in the Shastry-Sutherland-Lattice Yb${}_2$Pt${}_2$Pb
• Quadrupolar Frustration in Shastry-Sutherland Lattice of DyB4 Studied by Resonant X-ray Scattering

Cited by in corpus (3)

• Majorana Corner Modes in a Second-Order Kitaev Spin Liquid
• Magnetic wallpaper Dirac fermions and topological magnetic Dirac insulators
• Spontaneous lattice distortion and crystal field effects in HoB4