Anharmonic phonon properties in Eu0.5Ba0.5TiO3
Affiliation:
1. School of Mathematics and Physics, Changzhou University, 1 Gehu, Changzhou , 213164, China
Abstract
Abstract
Phonon properties have been studied using reduced sound velocity of Eu0.5Ba0.5TiO3 (EBTO). To achieve this aim, the anharmonic phonon-phonon interaction and the spin-phonon interaction were used. It was shown that the reduced sound velocity of multiferroic EBTO exhibits a kink at TN = 1.9 K. This anomalously reduced sound velocity can be interpreted as an effect of vanishing magnetic ordering above TN. What’s more, the ferroelectric subsystem cannot be influenced by the magnetic subsystem above TN for TN ≪TC in the EBTO. It was found that the reduced sound velocity decreases as T increases near ferroelectric transition TC. That is to say, the sound velocity softens near ferroelectric transition TC. It is also noteworthy that the reduced sound velocity softens when the RE (the coupling between the ferroelectric pseudo-spins and phonons), V(3) and |V(4)| (the third- and fourth-order atomic force constants of the anharmonic phonons, respectively) increase. These conclusions are all in good accordance with the experimental data and theoretical results.
Publisher
Walter de Gruyter GmbH
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference16 articles.
1. [1] JANES D. L., BODNAR R. E., TAYLOR A. L., J. Appl. Phys., 49 (1978), 1452. 2. [2] MACA K., KACHLIK M., VANEK P., Phase Transit., 86 (2013), 73. 3. [3] GOIAN V., KAMBA S., VANEK P., SAVINOV M., Phase Transit., 86 (2013), 191. 4. [4] WEI T., ZHOU Q.J., YANG X., SONG Q.G., LI Z.P., QI X.L., LIU J.-M., Appl. Surf. Sci., 258 (2012), 4601. 5. [5] GOIAN W., KAMBA S., NUZHNYY D., VANEK P., KEMPA M., BOVTUN V., KNIZEK K., PROKLESKA J., BORODAVKA F., LEDINSKY M., GREGORA I., J. Phys.: Condens. Matter, 23 (2011), 025904.10.1088/0953-8984/23/2/025904
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