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Lamellar fluctuations melt ferroelectricity.

Journal Article · · Physical Review Letters
We consider a standard Ginzburg-Landau model of a ferroelectric whose electrical polarization is coupled to gradients of elastic strain. At the harmonic level, such flexoelectric interaction is known to hybridize acoustic and optic phonon modes and lead to phases with modulated lattice structures that precede the state with spontaneously broken inversion symmetry. Here, we use the self-consistent phonon approximation to calculate the effects of thermal and quantum polarization fluctuations on the bare hybridized modes to show that such long-range modulated order is unstable at all temperatures. We discuss the implications for the nearly ferroelectric SrTiO3 and KTaO3, and we propose that these systems are melted versions of an underlying modulated state that is dominated by nonzero momentum thermal fluctuations except at the very lowest temperatures.
Research Organization:
Argonne National Laboratory (ANL)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science - Graduate Student Research (SCGSR) Program; Universidad de Costa Rica - Vice-rectory for Research
DOE Contract Number:
AC02-06CH11357
OSTI ID:
2356809
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 131; ISSN 0031-9007
Country of Publication:
United States
Language:
English

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