Quadrupole effects in tetragonal crystals PrCu2Si2 and DyCu2Si2

Mitsumoto, K.; Goto, S.; Nemoto, Y.; Akatsu, M.; Goto, T.; Dung, N. D.; Matsuda, T. D.; Haga, Y.; Takeuchi, T.; Sugiyama, K.; Settai, R.; Onuki, Y.

doi:10.1088/0953-8984/25/29/296002

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Quadrupole effects in tetragonal crystals PrCu₂Si₂ and DyCu₂Si₂

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Mitsumoto, K., Goto, S., Nemoto, Y., Akatsu, M., Goto, T., Dung, N. D., et al. (2013). Quadrupole effects in tetragonal crystals PrCu₂Si₂ and DyCu₂Si₂. Journal of Physics: Condensed Matter, 25(29): 296002, pp. 296002-1-296002-8. doi:10.1088/0953-8984/25/29/296002.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-1E88-0

Abstract

We have investigated quadrupole effects in tetragonal crystals of PrCu2Si2 and DyCu2Si2 by means of low-temperature ultrasonic measurements. The elastic constant C-44 of PrCu2Si2 exhibits pronounced softening below 70 K down to a Neel temperature T-N = 20 K, which is described in terms of a quadrupole susceptibility for a Gamma(5) doublet ground state and a Gamma(3) singlet first excited state located at 15.6 K in the crystalline electric field scheme. The C-44 and C-66 of DyCu2Si2 also show softening below 70 K down to T-N1 = 9.7 K. A low-lying pseudo-sextet state consisting of three Kramers doublets of Gamma(6) circle plus 2 Gamma(7) brings about softening of C-44 and C-66 in DyCu2Si2.