Publication

Phase transitions and strain-induced ferroelectricity in SrTiO3 epitaxial thin films

Nava Setter, Alexander Tagantsev
2000
Journal Articles

Abstract

A Landau-Ginsburg-Devonshire-type theory is used to describe the mechanical substrate effect on equilibrium states and phase transitions in SrTiO3 epitaxial thin films. The misfit strain-temperature phase diagram of SrTiO3 films is developed taking into account the existence of two coupled instabilities (antiferrodistortive and ferroelectric) in this crystal. It is shown that SrTiO3 films remain paraelectric down to 0 K only in a narrow range of small negative misfit strains between -2 x 10(-3) and -2.2 x 10(-4). Outside this "paraelectric gap," he 2D clamping and straining of the film by the substrate leads to the appearance of ferroelectricity in SrTiO3 films. The temperature of the ferroelectric transition increases rapidly outside the aforementioned misfit strain range.

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https://infoscience.epfl.ch/entities/publication/b617a517-7d52-42a8-96c2-4bd9acfb4e91

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Nava Setter, Alexander Tagantsev
2000
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b617a517-7d52-42a8-96c2-4bd9acfb4e91

About this result

Related concepts (32)

Strontium titanate

Strontium titanate is an oxide of strontium and titanium with the chemical formula SrTiO3. At room temperature, it is a centrosymmetric paraelectric material with a perovskite structure. At low temperatures it approaches a ferroelectric phase transition with a very large dielectric constant ~104 but remains paraelectric down to the lowest temperatures measured as a result of quantum fluctuations, making it a quantum paraelectric.

Phase transition

In chemistry, thermodynamics, and other related fields, a phase transition (or phase change) is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas, and in rare cases, plasma. A phase of a thermodynamic system and the states of matter have uniform physical properties. During a phase transition of a given medium, certain properties of the medium change as a result of the change of external conditions, such as temperature or pressure.

Curie temperature

In physics and materials science, the Curie temperature (TC), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. The Curie temperature is named after Pierre Curie, who showed that magnetism was lost at a critical temperature. The force of magnetism is determined by the magnetic moment, a dipole moment within an atom which originates from the angular momentum and spin of electrons.

Related publications (32)

Phase transitions and strain-induced ferroelectricity in SrTiO3 epitaxial thin films

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