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- W2037641010 abstract "Precise measurements of the ultrasonic velocity have been performed in Sn2P2S6 single crystals in the temperature interval 290 to 420 K. It was shown that in the paraelectric phase above Tc ≈ 337 K the anomalous part of the ultrasonic velocity changes with critical exponent α = 0.5 with small multiplicative logarithmic correction, which is in agreement with renormalization group theory calculations of Folk et al. [1] for proper uniaxial ferroelectrics near the tricritical Lifshitz point on the phase diagram. In the ferroelectric phase the Landau-Khalatnikov theory is a good approximation to describe the critical ultrasonic velocity behaviour in Sn2P2S6.Prazise Messungen der Ultraschallgeschwindigkeit in Sn2P2S6-Einkristallen wurden im Temperaturbereich 290 bis 420 K durchgefuhrt. Es konnte gezeigt werden, das sich in der paraelektrischen Phase oberhalb Tc ≈ 337 K der anomale Teil der Ultraschallgeschwindigkeit mit dem kritischen Exponenten α = 0.5 andert. Ein kleiner multiplikativer logarithmischer Korrekturterm ist in Ubereinstimmung mit Rechnungen von Folk et al. auf der Basis der Gruppen-Renomalisierungs-Theorie echter einachsiger Ferroelektrika nahe dem trikritischen Lifshitz-Punkt des Phasendiagramms. In der ferroelektrischen Phase beschreibt die Landau-Khalatnikov-Theorie das kritische Verhalten der Ultraschallgeschwindigkeit gut." @default.
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- W2037641010 date "1999-10-01" @default.
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- W2037641010 title "The Critical Behaviour of Ultrasonic Velocity at a Second-Order Phase Transition in Sn2P2S6 Single Crystals" @default.
- W2037641010 doi "https://doi.org/10.1002/(sici)1521-3951(199910)215:2<1151::aid-pssb1151>3.0.co;2-f" @default.
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