Abstract
The acoustical, resistive, and magnetic properties of a La0.75Sr0.25MnO3 lanthanum manganite single crystal are investigated in the temperature range involving the second-order magnetic phase transition. The acoustical measurements are performed by the pulse-echo method in the frequency range 14–90 MHz. It is found that, as the temperature decreases, the velocity of a longitudinal acoustic wave propagating along the [111] axis in the single crystal drastically increases at temperatures below the critical point of the magnetic phase transition. No dispersion of the acoustic velocity is revealed. A sharp increase in the acoustic velocity is accompanied by the appearance of an acoustical absorption peak. The observed effects are discussed with due regard for the interaction of acoustic waves with the magnetic moments of the manganese ions.
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Translated from Fizika Tverdogo Tela, Vol. 47, No. 11, 2005, pp. 2015–2018.
Original Russian Text Copyright © 2005 by Goltsev, K. Dyakonov, Kartenko, Kulakova, Popov, Yakhkind, Mukovski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \), V. Dyakonov.
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Goltsev, A.V., Dyakonov, K.V., Kartenko, N.F. et al. Acoustical investigations of a La0.75Sr0.25MnO3 single crystal. Phys. Solid State 47, 2102–2105 (2005). https://doi.org/10.1134/1.2131152
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DOI: https://doi.org/10.1134/1.2131152