Quadrupole effects in tetragonal crystals PrCu₂Si₂ and DyCu₂Si

Quadrupole effects in tetragonal crystals PrCu₂Si₂ and DyCu₂Si

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...

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Veröffentlicht in:Journal of physics. Condensed matter 2013-07, Vol.25 (29), p.296002-296002
Hauptverfasser: Mitsumoto, Keisuke, Goto, Saori, Nemoto, Yuichi, Akatsu, Mitsuhiro, Goto, Terutaka, Dung, Nguyen D, Matsuda, Tatsuma D, Haga, Yoshinori, Takeuchi, Tetsuya, Sugiyama, Kiyohiro, Settai, Rikio, Onuki, Yoshichika
Format: Artikel
Sprache:eng
Schlagworte:
Coordination Complexes - chemistry
Copper - chemistry
Crystallization
Dysprosium - chemistry
Models, Chemical
Praseodymium - chemistry
Quantum Theory
Silicon - chemistry
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Zusammenfassung: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.
ISSN:1361-648X
DOI:10.1088/0953-8984/25/29/296002