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Ferroquadrupolar ordering in a magnetically ordered state in ErNiAl
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SYSNO ASEP 0557519 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Ferroquadrupolar ordering in a magnetically ordered state in ErNiAl Author(s) Ishii, I. (JP)
Kurata, Y. (JP)
Wada, Y. (JP)
Nohara, M. (JP)
Suzuki, T. (JP)
Araki, K. (JP)
Andreev, Alexander V. (FZU-D) RID, ORCIDNumber of authors 7 Article number 165147 Source Title Physical Review B. - : American Physical Society - ISSN 2469-9950
Roč. 105, č. 16 (2022)Number of pages 6 s. Language eng - English Country US - United States Keywords rare-earth intermetallic compounds ; magnetic properties ; acoustic properties Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects GA21-09766S GA ČR - Czech Science Foundation (CSF) LM2018096 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support FZU-D - RVO:68378271 UT WOS 000805006000004 EID SCOPUS 85129378610 DOI 10.1103/PhysRevB.105.165147 Annotation We conducted ultrasonic measurements to clarify whether a phase transition exists in hexagonal compound ErNiAl below the antiferromagnetic transition at 6 K. We discovered a significant elastic softening of the transverse modulus, C66, accompanied by a significant ultrasonic attenuation toward TQ=3.4 K, which is the temperature of a sharp downward peak in other moduli, indicating a phase transition at TQ. The crystal field analysis reveals that the softening of C66 below 80 K is due to an interlevel Oxy-type quadrupole interaction with a positive quadrupole-quadrupole coupling constant between the ground and excited Kramers doublets. A spontaneous expectation value of Oxy emerges at TQ in our crystal field model with the mean-field approximation. No quadrupolar ordering occurs in a magnetically ordered state because the degeneracy of quadrupoles is lifted by an internal magnetic field of magnetic ordering. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2023 Electronic address https://doi.org/10.1103/PhysRevB.105.165147
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