Quadrupolar Frustration in Shastry-Sutherland Lattice of DyB4 Studied by Resonant X-ray Scattering
Daisuke Okuyama, Takeshi Matsumura, Hironori Nakao, Youichi Murakami
TL;DR
This study investigates the geometrical frustration of quadrupolar and magnetic moments in DyB4 with a Shastry-Sutherland lattice, revealing short-range correlations and fluctuations in the frustrated plane through resonant x-ray scattering.
Contribution
It provides new insights into quadrupolar frustration and moment fluctuations in DyB4 using resonant x-ray scattering at the Dy LIII edge.
Findings
Short-range correlation of quadrupolar and magnetic moments in the frustrated plane.
Long-range antiferromagnetic order along the c axis.
Moments in the frustrated plane are fluctuating.
Abstract
We have observed geometrical frustration of quadrupolar and magnetic moments in dysprosium tetraboride, DyB4, where the rare-earth sites form a Shastry-Sutherland lattice. Resonant x-ray scattering at the LIII absorption edge of Dy was utilized. Analysis of the energy, polarization, temperature, and azimuthal-angle dependences of the E1 resonance of the (1 0 0) forbidden reflection show that the magnetic and quadrupolar components within the frustrated c plane have a short-range correlation, suggesting that the moments are fluctuating. By contrast, the basic antiferromagnetic component along the c axis has a long-range order.
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