The pressure dependence of the dielectric constants of SrTiO3 and (Ba0·05Sr0·95)TiO3 at low temperatures

Hegenbarth, E.; Frenzel, C.

doi:10.1016/s0011-2275(67)80111-5

Cited by 27 publications

(5 citation statements)

References 14 publications

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“…In this paper, we performed a combined experimental and theoretical study of the hydrostatic pressure effects on the electronic properties of the 2DES in LaAlO 3 -SrTiO 3 (001). On the one hand, experimental results [47][48][49] The data of reference 48 were measured at a bias field of 2.5 kV/cm, the other data without a bias field. The original data were taken at temperatures close to 4.2 K, but not necessarily at 4.2 K. If necessary we interpolated or extrapolated the measured data to 4.2 K. The solid line presents a fit to the function ǫr(P )=C/(P -P0) with C=1420 GPa ± 60 GPa and P0=-0.06 GPa ±0.01 GPa.…”

Section: Discussionmentioning

confidence: 99%

“…6(a,c). [47][48][49] The data of reference 48 were measured at a bias field of 2.5 kV/cm, the other data without a bias field. The original data were taken at temperatures close to 4.2 K, but not necessarily at 4.2 K. If necessary we interpolated or extrapolated the measured data to 4.2 K. The solid line presents a fit to the function ǫr(P )=C/(P -P0) with C=1420 GPa ± 60 GPa and P0=-0.06 GPa ±0.01 GPa.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

“…FIG.12: Measured pressure dependence of low-temperature dc-dielectric constant of SrTiO3 single crystals as compiled from the literature [47][48][49]. The data of reference48 were measured at a bias field of 2.5 kV/cm, the other data without a bias field.…”

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confidence: 99%

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Hydrostatic pressure response of an oxide-based two-dimensional electron system

et al. 2016

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Two-dimensional electron systems with fascinating properties exist in multilayers of standard semiconductors, on helium surfaces, and in oxides. Compared to the two-dimensional (2D) electron gases of semiconductors, the 2D electron systems in oxides are typically more strongly correlated and more sensitive to the microscopic structure of the hosting lattice. This sensitivity suggests that the oxide 2D systems are highly tunable by hydrostatic pressure. Here we explore the effects of hydrostatic pressure on the well-characterized 2D electron system formed at LaAlO3-SrTiO3 interfaces 1 and measure a pronounced, unexpected response. Pressure of ∼2 GPa reversibly doubles the 2D carrier density ns at 4 K. Along with the increase of ns, the conductivity and mobility are reduced under pressure. First-principles pressure simulations reveal the same behavior of the carrier density and suggest a possible mechanism of the mobility reduction, based on the dielectric properties of both materials and their variation under external pressure.

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Section: Discussionmentioning

confidence: 99%

Section: Dielectric Propertiesmentioning

confidence: 99%

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Hydrostatic pressure response of an oxide-based two-dimensional electron system

et al. 2016

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“…Uniaxial tensile strain applied to SrTiO3 again causes it to become ferroelectric and suggests a small negative critical pressure of magnitude of the order of 1 kbar (29). Measurements of the dielectric susceptibility under pressure (30)(31)(32) show a drastic suppression of the low-temperature dielectric response as pressure is increased, matching the trend seen in the oxygen isotope doping studies, which see a maximum in the size of χ at a substitution level of 36%, the same point where Tc tends to zero temperature. At this quantum critical point, the frequency of the polar transverse optical phonon mode responsible for the ferroelectric ordering approaches zero at the Brillouin zone center (29).…”

Section: Significancementioning

confidence: 99%

Quantum critical phenomena in a compressible displacive ferroelectric

Coak

Haines

Liu

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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The dielectric and magnetic polarizations of quantum paraelectrics and paramagnetic materials have in many cases been found to initially increase with increasing thermal disorder and hence, exhibit peaks as a function of temperature. A quantitative description of these examples of “order-by-disorder” phenomena has remained elusive in nearly ferromagnetic metals and in dielectrics on the border of displacive ferroelectric transitions. Here, we present an experimental study of the evolution of the dielectric susceptibility peak as a function of pressure in the nearly ferroelectric material, strontium titanate, which reveals that the peak position collapses toward absolute zero as the ferroelectric quantum critical point is approached. We show that this behavior can be described in detail without the use of adjustable parameters in terms of the Larkin–Khmelnitskii–Shneerson–Rechester (LKSR) theory, first introduced nearly 50 y ago, of the hybridization of polar and acoustic modes in quantum paraelectrics, in contrast to alternative models that have been proposed. Our study allows us to construct a detailed temperature–pressure phase diagram of a material on the border of a ferroelectric quantum critical point comprising ferroelectric, quantum critical paraelectric, and hybridized polar-acoustic regimes. Furthermore, at the lowest temperatures, below the susceptibility maximum, we observe a regime characterized by a linear temperature dependence of the inverse susceptibility that differs sharply from the quartic temperature dependence predicted by the LKSR theory. We find that this non-LKSR low-temperature regime cannot be accounted for in terms of any detailed model reported in the literature, and its interpretation poses an empirical and conceptual challenge.

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“…7 Vcm , respectively,in all cases. The apparatus f o r p r e s s u r e generation is described in(9).…”

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confidence: 99%