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- W2050818567 abstract "At the 105°K transition a strong peak in the attenuation and a step in the sound velocity were observed for all polarizations in all pure mode directions of propagation. The attenuation anomaly is due to the interaction of the sound wave with soft optical lattice vibrations having a wavevector →q = π/α (1, 1, 1)). The experimental results can be quantitatively explained in terms of an Akhiezer type process with strongly temperature dependent Grüneisen parameters. Am 105°K-Phasenübergang beobachteten wir in allen Hauptausbreitungsrichtungen und -polarisationen eine kräftige Spitze in der Absorption und eine Stufe in der Schallgeschwindigkeit. Diese Dämpfungsanomalie wird durch Wechselwirkung der Schallwelle mit weichen optischen Gitterschwingungen vom Wellenzahlvektor→q = π/α (1, 1, 1) verursacht. Die Ergebnisse des Experiments lassen sich quantitativ als Akhiezer-Prozess mit stark temperaturabhängigen Grüneisenparametern erklären." @default.
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- W2050818567 date "1970-04-01" @default.
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- W2050818567 title "Anomalous ultrasonic attenuation at the 105°K transition in strontium titanate" @default.
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- W2050818567 doi "https://doi.org/10.1016/0038-1098(70)90159-6" @default.
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