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We report on the specific heat, magnetic properties, and ultrasonic measurements of a single-crystalline DyCuGe. We reveal an antiferromagnetic ordering in the (001) plane at TN=7.40.28em0exK, which is higher than the reported transition temperature of polycrystalline samples. The transverse elastic moduli show a pronounced softening down to TN due to interlevel quadrupole-mediated interactions between the ground and excited Kramers doublets. Below TN, we further detected a huge softening accompanied by ultrasound attenuation in the transverse C₄₄ mode, suggesting a lattice instability. Our experimental and calculated results manifest that ferroquadrupolar interactions give rise to the lattice instability even in an antiferromagnetically ordered state.
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Ishii et al. (2024) studied this question.
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