Critical behaviors of photoinduced giant permittivity in potassium tantalate

Katayama, Ikufumi; Ichikawa, Yūki; Tanaka, Kōichiro

doi:10.1103/physrevb.67.100102

Cited by 29 publications

(1 citation statement)

References 9 publications

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“…[3][4][5] In addition, band-to-band optical excitation of electrons is observed to anomalously enhance the static dielectric constant in these pure crystals. 6,7 Both KTaO 3 and SrTiO 3 of cubic perovskite oxides have the highest symmetry O h 1 as a crystal. Therefore, all ͑seven͒ ⌫-point optical phonons are of odd mode, so that they cannot be observed by one-phonon Raman scattering ͑RS͒.…”

Section: Introductionmentioning

confidence: 99%

Violation of Raman selection rules induced by two femtosecond laser pulses inKTaO3

2005

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We have found that the crystalline symmetry of KTaO 3 is temporally changed by two incident femtosecond laser pulses having near-infrared frequencies. Raman-active two-phonons were excited coherently and resonantly by the frequency difference of the pulses. As a result, multi-step Coherent Anti-Stokes Raman Scattering ͑CARS͒ signals were observed; the frequency spacing of the signals corresponds to the frequency of originally Raman-inactive single-phonons at the Brillouin zone ͑BZ͒ edge. A model of BZ folding due to coherent accumulation of the phonons is presented to explain all aspects of this new phenomenon.

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Section: Introductionmentioning

confidence: 99%

Violation of Raman selection rules induced by two femtosecond laser pulses inKTaO3

2005

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Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

Wang

Jie

Yang

et al. 2019

Adv Funct Materials

156

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Ever since the beginning of this century, many kinds of materials have been reported to demonstrate colossal permittivity (CP) or colossal dielectric constant exceeding 10 3 . Accordingly, such CP materials and their further modification and improvement to achieve enhanced CP performance for promising applications in modern electronics, sensors, energy storage, and multifunctional devices and so on have attracted extensive attention. In this review, 2 a general overview of the recent advances in CP materials is provided, ranging from their various categories, physical mechanisms, and modulation methods to promising applications.First, various classes of CP materials are categorized in terms of their structures and dielectric properties. Subsequently, this review provides an insight into the CP mechanisms in views of barrier layer capacitance, defect-dipole cluster and polaronic effect. Moreover, the strategies and prototypical works are introduced in some aspects, including the manipulation of CP properties by doping, percolative capacitors and the methods employed to enhance the dielectric behaviors in CP materials with different forms. We then discuss a wide range of applications based on CP materials, such as modern electronics and energy storage. Finally, the challenges and opportunities for further investigation of CP materials are highlighted in the summary and future perspectives.

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Influence of Cu ions on the photo‐transport properties in KTaO₃:(Cu,V) single crystals

Rossella

Perucchini

Galinetto

et al. 2007

Phys. Status Solidi (c)

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Photoconductivity kinetics, temperature dependence and excitation spectra were measured in the intervals 15-300 K and 2-4.2 eV in KTaO 3 :(Cu,V) single crystals processed by oxidation/reduction treatments. The kinetics, excited by band-gap excitation, present very slow saturation times, while faster time responses were observed using excitation below the band-gap. The oxidized crystal exhibited higher photoconductivity when E light > 3 eV. Linear dependence on light intensity was measured, suggesting one center recombination processes. Optical absorption at room temperature was checked as complementary information.

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Critical behaviors of photoinduced giant permittivity in potassium tantalate

Cited by 29 publications

References 9 publications

Violation of Raman selection rules induced by two femtosecond laser pulses inKTaO3

Violation of Raman selection rules induced by two femtosecond laser pulses inKTaO3

Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

Influence of Cu ions on the photo‐transport properties in KTaO₃:(Cu,V) single crystals

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Critical behaviors of photoinduced giant permittivity in potassium tantalate

Cited by 29 publications

References 9 publications

Violation of Raman selection rules induced by two femtosecond laser pulses inKTaO3

Violation of Raman selection rules induced by two femtosecond laser pulses inKTaO3

Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

Influence of Cu ions on the photo‐transport properties in KTaO3:(Cu,V) single crystals

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Product

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Influence of Cu ions on the photo‐transport properties in KTaO₃:(Cu,V) single crystals