Ultrasonic dispersion in the hexagonal ferromagnet Nd.sub.3./sub.Ru.sub.4./sub.Al.sub.12./sub.

0539061 - FZÚ 2021 RIV JP eng C - Konferenční příspěvek (zahraniční konf.)
Suzuki, T. - Mizuno, T. - Kumano, S. - Umeno, T. - Suzuki, D. - Andreev, Alexander V. - Gorbunov, D.I. - Henriques, Margarida Isabel Sousa - Ishii, I.
Ultrasonic dispersion in the hexagonal ferromagnet Nd₃Ru₄Al₁₂.
JPS Conference Proceedings. Vol. 30. Tokyo: Physical Society of Japan, 2020 - (Hotta, T.; Katsufuji, T.), s. 1-6, č. článku 011091. ISBN 978-4-89027-142-9. ISSN 2435-3892.
[International Conference on Strongly Correlated Electron Systems (SCES2019). Okayama (JP), 23.09.2020-28.09.2020]
Grant CEP: GA ČR(CZ) GA19-00925S; GA ČR(CZ) GJ19-07931Y
Institucionální podpora: RVO:68378271
Klíčová slova: Nd₃Ru₄Al₁₂ * rattling motion * elastic modulus * ultrasonic dispersion
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

The rare-earth ferromagnet Nd3Ru4Al12 has Curie temperature 39 K and crystallizes in the hexagonal Gd3Ru4Al12-type structure, which is a non-caged structure. A previous measurement of the elastic moduli has shown an upturn around 10 K in the temperature dependence of the longitudinal modulus C33. The upturn is not caused by any phase transition. To investigate the origin of the upturn, we measured the temperature dependence of C33 at various ultrasonic frequencies. The temperature of the upturn increases with increasing ultrasonic frequency indicating the ultrasonic dispersion, and it does not change under applied magnetic fields. These results suggest that the upturn originates from the rattling effect at one of the Al sites in the crystal structure.

Trvalý link: http://hdl.handle.net/11104/0316815