Publication

Short- and long-range polar order contributions to the Ferroelectric phase of Ca2+ doped SrTiO3

Alexander Tagantsev
2016
Journal Articles

Abstract

Short- and long-range impurity-induced polar ordering in Sr1-xCaxTiO3 (x = 0.014) single crystals was investigated and discussed on the basis of light refraction, morphic birefringence and temperature-dependent dielectric hysteresis loop measurements. Anew method for the calculation of the short-range polar order contribution P-sh in ferroelectric (FE) phases below T-C from light refraction measurements was applied. This method considers optical indicatrix perturbation due to polar ordering taking into account polarization fluctuations. The magnitudes and temperature dependences of P-sh originated by spatial fluctuations and long-range spontaneous polarization P-s were determined. These results allowed us to obtain quantitatively and to compare short (P-sh)-and long (P-s) range polar order contributions to the formation of impurity-induced FE phase in quantum paraelectrics.

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https://infoscience.epfl.ch/entities/publication/bca4f2b0-3bc1-419b-a1fc-9d5a8a32cf3c

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Alexander Tagantsev
2016
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/bca4f2b0-3bc1-419b-a1fc-9d5a8a32cf3c

About this result

Related concepts (26)

Ferroelectricity

Ferroelectricity is a characteristic of certain materials that have a spontaneous electric polarization that can be reversed by the application of an external electric field. All ferroelectrics are also piezoelectric and pyroelectric, with the additional property that their natural electrical polarization is reversible. The term is used in analogy to ferromagnetism, in which a material exhibits a permanent magnetic moment. Ferromagnetism was already known when ferroelectricity was discovered in 1920 in Rochelle salt by Joseph Valasek.

Refractive index

In optics, the refractive index (or refraction index) of an optical medium is a dimensionless number that gives the indication of the light bending ability of that medium. The refractive index determines how much the path of light is bent, or refracted, when entering a material. This is described by Snell's law of refraction, n1 sin θ1 = n2 sin θ2, where θ1 and θ2 are the angle of incidence and angle of refraction, respectively, of a ray crossing the interface between two media with refractive indices n1 and n2.

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High-temperature superconductors (abbreviated high-Tc or HTS) are defined as materials with critical temperature (the temperature below which the material behaves as a superconductor) above , the boiling point of liquid nitrogen. They are only "high-temperature" relative to previously known superconductors, which function at even colder temperatures, close to absolute zero. The "high temperatures" are still far below ambient (room temperature), and therefore require cooling.

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