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Pis'ma v Zh. Èksper. Teoret. Fiz., 2001, Volume 74, Issue 2, Pages 120–122 (Mi jetpl4170)  

CONDENSED MATTER

Giant thermal hysteresis of sound velocity and internal friction in a La$_{0.8}$Sr$_{0.2}$MnO$_3$ single crystal

R. I. Zainullinaa, N. G. Bebenina, A. M. Burkhanova, V. V. Ustinova, Ya. M. Mukovskiib, A. A. Arsenovb

a Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, Ekaterinburg
b Moscow State Institute of Steel and Alloys

Abstract: Temperature dependences of the velocity of longitudinal sound $V_1$ and the internal friction $Q^{-1}$ are studied for a La$_{0.8}$Sr$_{0.2}$MnO$_3$ single crystal in the temperature range $5$$350$ K. The latter includes the temperature of the structural phase transition $T_s\approx95 $ K (from the $Pnma$ orthorhombic low-temperature phase to the $R\bar{3}c$ rhombohedral high-temperature one) and the Curie point $T_c=308 $ K. Near the temperatures $T_s$ and $T_c$, the curves $V_1(T)$ and $Q^{-1}(T)$ exhibit pronounced singularities. Outside the vicinities of $T_s$ and $T_c$, the velocity of sound monotonically decreases with increasing temperature. A thermal hysteresis of giant width is observed in the aforementioned dependences. The hysteresis is attributed to the following mechanism: when the crystal under study is heated starting at temperatures $T<T_s$, some regions occupied by the $Pnma$ low-temperature phase are retained in the $R\bar{3}c$ matrix up to the temperature $T=350 $ K.

Full text: PDF file (225 kB)

English version:
Journal of Experimental and Theoretical Physics Letters, 2001, 74:2, 115–117

Document Type: Article
PACS: 62.65.+k, 64.70.Kb
Received: 25.06.2001

Citation: R. I. Zainullina, N. G. Bebenin, A. M. Burkhanov, V. V. Ustinov, Ya. M. Mukovskii, A. A. Arsenov, “Giant thermal hysteresis of sound velocity and internal friction in a La$_{0.8}$Sr$_{0.2}$MnO$_3$ single crystal”, Pis'ma v Zh. Èksper. Teoret. Fiz., 74:2 (2001), 120–122; JETP Letters, 74:2 (2001), 115–117

Citation in format AMSBIB
\Bibitem{ZaiBebBur01}
\by R.~I.~Zainullina, N.~G.~Bebenin, A.~M.~Burkhanov, V.~V.~Ustinov, Ya.~M.~Mukovskii, A.~A.~Arsenov
\paper Giant thermal hysteresis of sound velocity and internal friction in a La$_{0.8}$Sr$_{0.2}$MnO$_3$ single crystal
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
\yr 2001
\vol 74
\issue 2
\pages 120--122
\mathnet{http://mi.mathnet.ru/jetpl4170}
\transl
\jour JETP Letters
\yr 2001
\vol 74
\issue 2
\pages 115--117
\crossref{https://doi.org/10.1134/1.1405898}
\scopus{http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-18044404361}


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