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Multipole effects in non-Kramers doublet system PrMg3 |
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| Authors: | K Araki T Yoshikawa I Ishii T Goto H Tanida B Lüthi |
| Institution: | a Graduate School of Science and Technology, Niigata University, Niigata 950-2102, Japan b National Institute for Materials Science, Tsukuba 305-0047, Japan c Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan d Physics Department, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan e Physikalisches Institut, Universität Frankfurt, 60054 Frankfurt, Germany |
| Abstract: | We performed ultrasonic measurements on a single crystal of PrMg3. The characteristic Curie-type softening was observed in temperature dependence of transverse mode (C11-C12)/2 below 8 K down to 0.8 K. This softening in PrMg3 is caused by a non-Kramers Γ3 doublet ground state having electric quadrupoles Ou and Ov and magnetic octupole Txyz. The elastic constant (C11-C12)/2 shows a minimum at 25 K, which cannot be explained by the quadrupole susceptibility based on the crystal electric field (CEF) levels. However, considering higher order (l=4) multipole, namely electric hexadecapole, the minimum around 25 K was well reproduced. At lower temperatures, a shoulder anomaly in elastic constant being deviated from the Curie-type softening was observed around 100-800 mK in (C11-C12)/2. This anomaly is unaffected by magnetic fields up to 14 T. |
| Keywords: | PrMg3 Elastic constant Non-Kramers doublet Multipole Ultrasound |
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