Geometrical quadrupolar frustration in DyB$_4$

Details Geometrical quadrupolar frustration in DyB$_4$ Geometrical quadrupolar frustration in DyB$_4$

2005-06-23

arxiv.org/abs/cond-mat/0506593v3

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, accepted for publication in Journal of the Physical Society of Japan

Scientific paper

10.1143/JPSJ.74.2169

Physical properties of DyB$_4$ have been studied by magnetization, specific heat, and ultrasonic measurements. The magnetic entropy change and the ultrasonic properties in the intermediate phase II indicate that the degeneracy of internal degrees of freedom is not fully lifted in spite of the formation of magnetic order. The ultrasonic attenuation and the huge softening of $C_{44}$ in phase II suggests existence of electric-quadrupolar (orbital) fluctuations of the 4$f$-electron. These unusual properties originate from the geometrical quadrupolar frustration.

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