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Ultrasonic study on the hexagonal antiferromagnet Dy.sub.3./sub.Ru.sub.4./sub.Al.sub.12./sub.

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    0476793 - FZÚ 2018 RIV GB eng C - Conference Paper (international conference)
    Ishii, I. - Takezawa, K. - Goto, H. - Kamikawa, S. - Andreev, Alexander V. - Gorbunov, D.I. - Henriques, Margarida Isabel Sousa - Suzuki, T.
    Ultrasonic study on the hexagonal antiferromagnet Dy3Ru4Al12.
    Journal of Physics: Conference series. Vol. 807. Bristol:: IOP Publishing Ltd., 2017, s. 1-5, č. článku 012002. ISSN 1742-6588.
    [International Conference on Strongly Correlated Electron Systems /18./ (SCES 2016). Hangzhou (CN), 09.05.2016-13.05.2016]
    R&D Projects: GA ČR GA16-03593S; GA ČR(CZ) GA14-03276S
    Institutional support: RVO:68378271
    Keywords : rare-earth intermetallics * antiferromagnetism * elastic properties
    OECD category: Condensed matter physics (including formerly solid state physics, supercond.)

    In the distorted kagome lattice antiferromagnet Dy 3 Ru 4 Al 12 with T N = 7 K, a crystal electric field (CEF) effect is expected at high temperatures. To investigate the CEF effect and the phase transition at T N , we performed ultrasonic measurements on a single-crystalline sample. At high temperatures, both the longitudinal elastic modulus C 11 and the transverse modulus C 44 increase monotonically with decreasing temperature. Below 60 K a characteristic elastic softening is observed in C 44 in contrast to C 11 with monotonic hardening down to T N . We analyzed C 44 using the Curie-Weiss-type equation and obtained a negative parameter: θ which is proportional to a quadrupole-quadrupole coupling constant under the hexagonal CEF. With further decreasing temperature, both moduli exhibit abrupt elastic hardening at T N due to a magnetostriction.
    Permanent Link: http://hdl.handle.net/11104/0273207

     
     
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