Anharmonic phonon properties in Eu0.5Ba0.5TiO3

• Autorzy: Cao X.-S.

Identyfikatory

DOI

10.1515/msp-2018-0003

• Języki publikacji: EN

Abstrakty

EN

Phonon properties have been studied using reduced sound velocity of Eu_0.5Ba_0.5TiO₃ (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 T_N = 1.9 K. This anomalously reduced sound velocity can be interpreted as an effect of vanishing magnetic ordering above T_N. What’s more, the ferroelectric subsystem cannot be influenced by the magnetic subsystem above T_N for T_N ≪T_C in the EBTO. It was found that the reduced sound velocity decreases as T increases near ferroelectric transition T_C. That is to say, the sound velocity softens near ferroelectric transition T_C. It is also noteworthy that the reduced sound velocity softens when the R^E (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.

Słowa kluczowe

EN

anharmonic phonon-phonon interaction; reduced sound velocity; multiferroics

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2018
• Tom: Vol. 36, No. 1
• Strony: 141--144
• Opis fizyczny: Bibliogr. 16 poz., rys.

Twórcy

autor

Cao X.-S.

• School of Mathematics and Physics, Changzhou University, 1 Gehu, Changzhou, 213164, China

Bibliografia

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).