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- W2903103916 abstract "The question whether ferroelectricity (FE) may coexist with a metallic or highly conducting state or rather it must be suppressed by the screening from the free charges is the focus of a rapidly increasing number of theoretical studies and is finally receiving positive experimental responses. The issue is closely related to the thermoelectric and multiferroic (also magnetic) applications of FE materials where the electrical conductivity is required or spurious. In these circumstances, the traditional methods for probing ferroelectricity are hampered or made totally ineffective by the free charges, which screen the polar response to an external electric field. This fact may explain why more than 40 years passed among the first proposals of FE metals and the present experimental and theoretical activities. The measurement of the elastic moduli, Young's modulus in the present case, versus temperature is an effective method for studying the influence of doping on a FE transition because the elastic properties are unaffected by electrical conductivity. In this manner, it is shown that the FE transitions of ${mathrm{BaTiO}}_{3ensuremath{-}ensuremath{delta}}$ are not suppressed by electron doping through O vacancies; only the onset temperatures are depressed, but the magnitudes of the softenings, and hence of the piezoelectric activity, are initially even increased." @default.
- W2903103916 created "2018-12-11" @default.
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- W2903103916 date "2019-02-12" @default.
- W2903103916 modified "2023-10-18" @default.
- W2903103916 title "Probing ferroelectricity in highly conducting materials through their elastic response: Persistence of ferroelectricity in metallic <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>BaTiO</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:math>" @default.
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- W2903103916 doi "https://doi.org/10.1103/physrevb.99.064106" @default.
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