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Spontaneous structural distortion of the metallic Shastry-Sutherland system Dy B 4 by quadrupole-spin-lattice coupling

DOI: 10.1103/PhysRevB.94.195128 DOI Help

Authors: Hasung Sim (Seoul National University; Institute for Basic Science (IBS)) , Seongsu Lee (Korea Atomic Energy Research Institute) , Kun-pyo Hong (Institute for Basic Science (IBS)) , Jaehong Jeong (Seoul National University; Institute for Basic Science (IBS)) , J. R. Zhang (Institute of Materials Science & J-PARC Center) , T. Kamiyama (Institute of Materials Science & J-PARC Center) , D. T. Adroja (ISIS Facility; University of Johannesburg) , C. A. Murray (Diamond Light Source) , S. P. Thompson (Diamond Light Source) , F. Iga (Ibaraki University) , S. Ji (Pohang University of Science and Technology) , D. Khomskii (University of Koeln) , Je-geun Park (Seoul National University; Institute for Basic Science (IBS))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 94

State: Published (Approved)
Published: November 2016
Diamond Proposal Number(s): 12470

Abstract: DyB4 has a two-dimensional Shastry-Sutherland (Sh-S) lattice with strong Ising character of the Dy ions. Despite the intrinsic frustrations, it undergoes two successive transitions: a magnetic ordering at TN=20K and a quadrupole ordering at TQ=12.5K. 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 paper 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 Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in metallic DyB4, play an important role in this behavior.

Subject Areas: Physics

Instruments: I11-High Resolution Powder Diffraction