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Ultrasonic Dispersion in the Hexagonal Ferromagnet Nd3Ru4Al12

Suzuki, T.; Mizuno, T.; Kumano, S.; Umeno, T.; Suzuki, D.; Andreev, A. V.; Gorbunov, D.; Henriques, M. S.; Ishii, I.
The rare-earth ferromagnet Nd3Ru4Al12 has Curie temperature TC= 39 K and crystallizes in the hexagonal Gd3Ru4Al12-type structure (space group P63/mmc), 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 in Nd3Ru4Al12, we have 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 aluminium sites in the crystal structure. Assuming a Debye-type relaxation for the elastic modulus and an Arrhenius-type relaxation time for the rattling, the activation energy was estimated as E = 115 K and the relaxation time as Ƭ0 = 1.5 x 10-13s.
  • Contribution to proceedings
    International Conference on Strongly Correlated Electron Systems (SCES2019), 23.-28.09.2019, Okayama, Japan
    JPS Conference Proceedings 30(2020), 011091
    DOI: 10.7566/JPSCP.30.011091

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Publ.-Id: 30843