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J Phys Condens Matter. 2013 Jul 24;25(29):296002. doi: 10.1088/0953-8984/25/29/296002. Epub 2013 Jun 26.

Quadrupole effects in tetragonal crystals PrCu₂Si₂ and DyCu₂Si₂.

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Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan.


We have investigated quadrupole effects in tetragonal crystals of PrCu2Si2 and DyCu2Si2 by means of low-temperature ultrasonic measurements. The elastic constant C44 of PrCu2Si2 exhibits pronounced softening below 70 K down to a Néel temperature TN = 20 K, which is described in terms of a quadrupole susceptibility for a Γ5 doublet ground state and a Γ3 singlet first excited state located at 15.6 K in the crystalline electric field scheme. The C44 and C66 of DyCu2Si2 also show softening below 70 K down to TN1 = 9.7 K. A low-lying pseudo-sextet state consisting of three Kramers doublets of Γ6⊕2Γ7 brings about softening of C44 and C66 in DyCu2Si2.

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