Geometrical Quadrupolar Frustration in DyB<sub>4</sub>

Watanuki, Ryuta; Sato, Gou; Suzuki, Kunio; Ishihara, Masaki; Yanagisawa, Tatsuya; Nemoto, Y.; Gotô, Terutaka

doi:10.1143/jpsj.74.2169

Cited by 97 publications

(61 citation statements)

References 21 publications

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“…Even in this case, there is some residual degeneracy left in the ground state. This remaining frustration may be further released via dynamic fluctuations of the quadrupole degree of freedom, evidenced by the continuous softening of the lattice as seen in our low temperature diffraction data and the ultrasound measurements [16]. This softening of the lattice degree of freedom in the antiferromagnetic ordered phase is a direct consequence of a strong spin-orbit coupling of Dy together with quadrupole-strain coupling as discussed in Ref.…”

Section: Discussion and Summarysupporting

confidence: 65%

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

et al. 2016

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DyB 4 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 T N = 20K, and a quadrupole ordering at T Q =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 DyB 4 , play an important role in this behavior.

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Section: Discussion and Summarysupporting

confidence: 65%

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

et al. 2016

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“…It was shown that all heavy REB 4 (RE = Tb, Dy, Ho, Er, Tm) exhibit a strong Ising-like anisotropy which orients the RE magnetic moments along the c-axis, and complex phase diagrams below T N (TbB 4 ) = 43 K, T TN (DyB 4 ) = 20.3 K, T TN (HoB 4 ) = 7.1 K, T TN (ErB 4 ) = 15.4 K and T TN (TmB 4 ) = 11.7 K [1][2][3][4][5]. Moreover, in the ordered antiferromagnetic (AF) state of TmB 4 , the magnetization M for B c reaches saturation M S at about 4 T accompanied by plateaus at 1/8 M S and 1/2 M S .…”

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confidence: 99%

Magnetic Structure and Phase Diagram of TmB₄

et al. 2008

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Magnetic structure of single crystalline TmB 4 has been studied by magnetization, magnetoresistivity, and specific heat measurements. A complex phase diagram with different antiferromagnetic phases was observed below T N1 = 11.7 K. Besides the plateau at half-saturated magnetization (1/2 M S ), also plateaus at 1/9, 1/8 and 1/7 of MS were observed as a function of applied magnetic field B c. From additional neutron scattering experiments on TmB4, we suppose that these plateaus arise from a stripe structure which appears to be coherent domain boundaries between antiferromagnetic-ordered blocks of 7 or 9 lattice constants. The received results suggest that the frustration among the Tm 3+ magnetic ions, which maps to a geometrically frustrated Shastry-Sutherland lattice, leads to a strong competition between antiferromagnetic and ferromagnetic order. Thus, stripe structures in intermediate field appear to be the best way to minimize the magnetostatic energy against other magnetic interactions among the Tm ions combined with very strong Ising anisotropy.PACS numbers: 75.30.Kz, 75.25.+z IntroductionRare earth tetraborides REB 4 crystallize in a tetragonal structure with the space group P 4/mbm, where the RE ions map to a Shastry-Sutherland type geometrically frustrated lattice (SSL) in the c-plane. It was shown that all heavy REB 4 (RE = Tb, Dy, Ho, Er, Tm) exhibit a strong Ising-like anisotropy which orients the RE magnetic moments along the c-axis, and complex phase dia-

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“…So the partial ordered state, where only the c-component of magnetic moments orders and the abcomponents disorder, appears for TN1>T> TN2, This type of transitions often appears in frustration systems. The geometrical frustration, which comes from a competition of multiple interactions due to a geometrical ion arrangement, is responsible for most of frustrations [2,3]. The geometrical frustration is, however, not like to occur in this compound due to the structure.…”

Section: Introductionmentioning

confidence: 94%