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Bulk properties of the van der Waals hard ferromagnet <tex> $ \mathrm{VI}_{3}$</tex>
Son, Suhan,Coak, Matthew J.,Lee, Nahyun,Kim, Jonghyeon,Kim, Tae Yun,Hamidov, Hayrullo,Cho, Hwanbeom,Liu, Cheng,Jarvis, David M.,Brown, Philip A. C.,Kim, Jae Hoon,Park, Cheol-Hwan,Khomskii, Daniel I.,S American Physical Society 2019 Physical Review B Vol.99 No.4
Sim, Hasung,Lee, Seongsu,Hong, Kun-Pyo,Jeong, Jaehong,Zhang, J. R.,Kamiyama, T.,Adroja, D. T.,Murray, C. A.,Thompson, S. P.,Iga, F.,Ji, S.,Khomskii, D.,Park, Je-Geun American Physical Society 2016 Physical Review B Vol.94 No.19
<P>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 T-N = 20K and a quadrupole ordering at T-Q = 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.</P>