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Uwe, Hiromoto; Sakudo, Tunetaro

doi:10.1103/physrevb.13.271

Cited by 443 publications

(307 citation statements)

References 46 publications

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“…[22][23][24]. Although STO crystals or polycrystalline ceramics remains paraelectric down to absolute zero, the ferroelectric phase can be induced by pressure [25], electrical field [26], doping [27], and through equi-biaxial in-plane misfit strains in epitaxial STO films [28,29]. A thermodynamic analysis by Pertsev et al [29,30] has shown that it is possible to induce a variety of different ferroelectric phases in epitaxial thin films of STO that are not stable in monolithic singlecrystal or polycrystalline forms.…”

Section: Perovskite-structured Ferroelectric Materialsmentioning

confidence: 99%

Electrothermal properties of perovskite ferroelectric films

et al. 2009

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The electrothermal (electrocaloric and pyroelectric) properties of ferroelectric thin films have many applications in active solid-state cooling and infrared sensing devices. It has been shown experimentally that some thin-film ferroelectrics can produce much larger electrothermal responses than their bulk counterparts. In this work, the electrothermal properties of bulk polar dielectric (ferroelectric and incipient ferroelectric) materials and thin films have been computed using a thermodynamic methodology and the effects of electrical, thermal and mechanical boundary conditions have been illustrated. In particular, the sensitivity of pyroelectric and electrocaloric response to bias and driving fields, lateral clamping and misfit strain, thermal stresses and composition have been demonstrated. The computations show that the electrothermal behavior of ferroelectric materials for practical cooling devices depends on a complex interplay of several related sets of physical phenomena. These include the nature of the ferroelectric transition, the particular dependence of the equilibrium and transport properties on electric field and mechanical boundary constraints, and the orientation and thermal expansion coefficients of the thin film and substrate materials. The combined results provide insights concerning how the composition and orientation of the thin film material, the choice of substrate, the deposition/annealing temperature, and the electrode configuration can be used to optimize the electrothermal properties for particular applications.

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Section: Perovskite-structured Ferroelectric Materialsmentioning

confidence: 99%

Electrothermal properties of perovskite ferroelectric films

et al. 2009

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“…It emerges in SrTiO 3 by isotopic substitution of 16 O oxygen atoms with 18 O (ref. 11), application of stress 12 or substitution of a tiny fraction of Sr with Ca (ref. 3).…”

mentioning

confidence: 99%

A ferroelectric quantum phase transition inside the superconducting dome of Sr1−xCaxTiO3−δ

Rischau¹,

Lin²,

Grams³

et al. 2017

Nature Phys

213

230

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SrTiO 3 , a quantum paraelectric 1 , becomes a metal with a superconducting instability after removal of an extremely small number of oxygen atoms 2 . It turns into a ferroelectric upon substitution of a tiny fraction of strontium atoms with calcium 3 . The two orders may be accidental neighbours or intimately connected, as in the picture of quantum critical ferroelectricity 4 . Here, we show that in Sr 1−x Ca x TiO 3−δ (0.002 < x < 0.009, δ < 0.001) the ferroelectric order coexists with dilute metallicity and its superconducting instability in a finite window of doping. At a critical carrier density, which scales with the Ca content, a quantum phase transition destroys the ferroelectric order. We detect an upturn in the normal-state scattering and a significant modification of the superconducting dome in the vicinity of this quantum phase transition. The enhancement of the superconducting transition temperature with calcium substitution documents the role played by ferroelectric vicinity in the precocious emergence of superconductivity in this system, restricting possible theoretical scenarios for pairing.A perovskite of the ABO 3 family, SrTiO 3 is a quantum paraelectric whose dielectric constant rises to ∼20,000 at low temperature 1 , but avoids long-range ferroelectric order. It becomes a metal by substituting Sr with La, Ti with Nb, or by removing O. It has been known for half a century that this metal is a superconductor at low temperatures 2 . More recently, a sharp Fermi surface and a superconducting ground state have been found to persist down to a carrier concentration of 10 17 cm −3 in SrTiO 3−δ (refs 5,6 However, mobile electrons screen polarization and therefore only insulating solids are expected to host a ferroelectric order. Hitherto, as a paradigm, ferroelectric quantum criticality, in contrast to its magnetic counterpart, was deprived of an experimental phase diagram in which a superconducting phase and a ferroelectric order share a common boundary.Here, we produce such a phase diagram in the case of Sr 1−x Ca x TiO 3−δ . The main new observations are the following: metallic Sr 1−x Ca x TiO 3−δ hosts a phase transition structurally indistinguishable from the ferroelectric phase transition in insulating Sr 1−x Ca x TiO 3 ; the coexistence between this ferroelectric-like order and superconductivity ends beyond a threshold carrier concentration; and, in the vicinity of this quantum phase transition, calcium substitution enhances the superconducting critical temperature and induces an upturn in the normal-state resistivity.Figure 1 summarizes what we know about the emergence of ferroelectricity, metallicity and superconductivity in this system. When a small fraction of Sr atoms (x > 0.002) is replaced with isovalent Ca, Sr 1−x Ca x TiO 3 becomes ferroelectric 3 , with a Curie temperature steadily increasing with Ca content in the dilute limit 0.002 < x < 0.02 (refs 3,13,14). Macroscopic polarization below the Curie temperature has been observed in dielectric and linear birefringence measurements, a...

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“…In addition, stress caused by lattice mismatch between FeSe and STO substrate is also thought to be responsible for TC enhancement 4 . To figure out the key role of substrate, STO(110) substrate is of great interest because it resembles STO(001) in high density subsurface oxygen vacancies [22][23][24] but distinguishes itself by a rectangular in-plane lattice 25,26 and the correspondingly different dielectric constants 27,28 . Here, we investigated molecular beam epitaxy (MBE) growth of 1-UC FeSe films on STO(110) substrates (referred as FeSe/STO(110) hereafter) and studied the superconducting properties by combined in-situ STS and ex-situ transport measurement.…”

mentioning

confidence: 99%

Interface induced high temperature superconductivity in single unit-cell FeSe on SrTiO3(110)

Zhou

Zhang

Liu

et al. 2016

Applied Physics Letters

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We report high temperature superconductivity in one unit-cell (1-UC) FeSe films grown on SrTiO3 (STO) (110) substrate by molecular beam epitaxy. By in-situ scanning tunneling microscopy measurement, we observe a superconducting gap as large as 17 meV on the 1-UC FeSe films. Transport measurements on 1-UC FeSe/STO(110) capped with FeTe layers reveal superconductivity with an onset transition temperature (TC) of 31.6 K and an upper critical magnetic field of 30.2 T. We also find that TC can be further increased by external electric field although the effect is weaker than that on STO(001) substrate.

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Stress-induced ferroelectricity and soft phonon modes in SrTiO3

Cited by 443 publications

References 46 publications

Electrothermal properties of perovskite ferroelectric films

Electrothermal properties of perovskite ferroelectric films

A ferroelectric quantum phase transition inside the superconducting dome of Sr1−xCaxTiO3−δ

Interface induced high temperature superconductivity in single unit-cell FeSe on SrTiO3(110)

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