Pressure-induced charge ordering transition in 
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Stękiel, Michał; Girard, Adrien; Zimmer, Dominik; Monteseguro, V.; Glazyrin, Konstantin; Pedro, Imanol de; Bayarjargal, Lkhamsuren; Winkler, Björn; Ruiz‐Fuertes, J.

doi:10.1103/physrevb.105.064110

Cited by 2 publications

(1 citation statement)

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“…where l i is the individual bond length and l av is the average Ti-O bond length [42]. The octahedral distortion of the T iO 6 octahedra reduces from 0.015 Å at 0.5 GPa to 0.002 Å at 2 GPa, as shown in Fig.…”

Section: Resultsmentioning

confidence: 76%

High pressure ferroelectric-like metallic state in $Eu-$doped $BaTiO_3$

Sahu¹,

Ghosh²,

Joseph³

et al. 2023

Preprint

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We have conducted a detailed high-pressure (HP) investigation on Eu−doped BaT iO 3 using angle-resolved x-ray diffraction, Raman spectroscopy, dielectric permittivity and dc resistance measurements. The x-ray diffraction data analysis shows a pressure-induced structural phase transition from the ambient tetragonal to the mixed cubic and tetragonal phase above 1.4 GPa. The tetragonality of the sample due to the internal deformation of the T iO 6 octahedra caused by charge difference from Eu doping cannot be lifted upon by pressure. Softening, weakening, and disappearance of low-frequency Raman modes indicate ferroelectric tetragonal to the paraelectric cubic phase transition. But the pressure-induced increase in the intensity of [E(LO), A1(LO)] and the octahedral breathing modes indicate the local structural inhomogeneity remains in the crystal and is responsible for spontaneous polarization in the sample. Low-frequency electronic scattering response suggests the pressure-induced carrier delocalization, leading to a semi-metallic state in the system. Our HP dielectric constant and dc resistance data can be explained by the presence of

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Section: Resultsmentioning

confidence: 76%