Behavior of sound velocities in the compounds La1−x
SrxMnO3 near magnetic and structural phase transitions |
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| Authors: | Yu P Gaidukov N P Danilova A A Mukhin A M Balbashov |
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| Institution: | (1) Department of Physics, M. V. Lomonosov Moscow State University, 119899 Moscow, Russia;(2) Institute of General Physics, Russian Academy of Sciences, 117924 Moscow, Russia;(3) Moscow Power Engineering Institute, 105835 Moscow, Russia |
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| Abstract: | The temperature dependences of the transverse V
t
and longitudinal V
l
sound velocities in single crystals of the perovskites La1−x
SrxMnO3 (x=0.1, 0.175, 0.2, 0.25) in the temperature interval T=70–350 K are investigated by the resonance method. Anomalies — small minima and kinks in the temperature dependences V
l
(T) and V
t
(T) — are observed at the Curie points. A strong jumplike increase (by up to 30%) in both the longitudinal and transverse sound
velocities, which attests to sizable hardening of the acoustic branches of the phonon spectrum, is observed near the temperatures
of the structural transitions between the rhombohedral and orthorhombic phases (for x=0.175, 0.2, 0.25) and at the phase transition to the polaron-ordered state (for x=0.1).
Pis’ma Zh. éksp. Teor. Fiz. 68, No. 2, 141–146 (25 July 1998) |
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| Keywords: | |
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