Flexocoupling impact on the generalized susceptibility and soft phonon modes in the ordered phase of ferroics

Morozovska, Anna N.; Vysochanskii, Yulian M.; Varenyk, Oleksandr V.; Silibin, Maxim V.; Kalinin, Sergei V.; Eliseev, Eugene A.

doi:10.1103/PhysRevB.92.094308

Flexocoupling impact on the generalized susceptibility and soft phonon modes in the ordered phase of ferroics

Journal Article · Tue Sep 29 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.094308· OSTI ID:1265993

Morozovska, Anna N. ^[1]; Vysochanskii, Yulian M. ^[2]; Varenyk, Oleksandr V. ^[1]; Silibin, Maxim V. ^[3]; Kalinin, Sergei V. ^[4]; Eliseev, Eugene A. ^[5]

National Academy of Sciences of Ukraine, Kiev (Ukraine)
Uzhgorod Univ., Uzhgorod (Ukraine)
National Research Univ. of Electronic Technology MIET, Moscow (Russia)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Academy of Sciences of Ukraine, Kyiv (Ukraine)

The impact of the flexoelectric effect on the generalized susceptibility and soft phonon dispersion is not well known in the long-range-ordered phases of ferroics. Within the Landau-Ginzburg-Devonshire approach we obtained analytical expressions for the generalized susceptibility and phonon dispersion relations in the ferroelectric phase. The joint action of the static and dynamic flexoelectric effects induces nondiagonal components of the generalized susceptibility, whose amplitude is proportional to the convolution of the spontaneous polarization with the flexocoupling constants. The flexocoupling essentially broadens the k spectrum of the generalized susceptibility and leads to an additional “pushing away” of the optical and acoustic soft mode phonon branches. The degeneracy of the transverse optical and acoustic modes disappears in the ferroelectric phase in comparison with the paraelectric phase due to the joint action of flexoelectric coupling and ferroelectric nonlinearity. Lastly, the results obtained might be mainly important for theoretical analyses of a broad spectrum of experimental data, including neutron and Brillouin scattering.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1265993

Alternate ID(s):: OSTI ID: 1222431

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 9 Vol. 92; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Quantification of flexoelectricity in PbTiO3/SrTiO3 superlattice polar vortices using machine learning and phase-field modeling Li, Q.; Nelson, C. T.; Hsu, S. -L. Nature Communications, Vol. 8, Issue 1 https://doi.org/10.1038/s41467-017-01733-8	journal	November 2017
Lost surface waves in nonpiezoelectric solids Eliseev, Eugene A.; Morozovska, Anna N.; Glinchuk, Maya D. Physical Review B, Vol. 96, Issue 4 https://doi.org/10.1103/physrevb.96.045411	journal	July 2017
Defect-driven flexochemical coupling in thin ferroelectric films Eliseev, Eugene A.; Vorotiahin, Ivan S.; Fomichov, Yevhen M. Physical Review B, Vol. 97, Issue 2 https://doi.org/10.1103/physrevb.97.024102	journal	January 2018
Defect driven flexo-chemical coupling in thin ferroelectric films Eliseev, Eugene A.; Vorotiahin, Ivan. S.; Fomichov, Yevhen M. arXiv https://doi.org/10.48550/arxiv.1708.00904	text	January 2017

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