Explanation for the temperature dependence of plasma frequencies in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">SrTiO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>using mixed-polaron theory

Eagles, D. M.; Georgiev, M.; Petrova, P.

doi:10.1103/physrevb.54.22

Cited by 37 publications

(30 citation statements)

References 17 publications

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“…In particular, the 1000 cm −1 feature has been attributed to optical transitions involving small 30 , large polarons 5,31 or both types of polarons 32 . In any case, as first noted by Bi and Eklund 33 in La 2−x Sr x CuO 4+δ , the polaron tend to be small in the dilute limit (small x) whereas in the limit of large x the polaron tend to expand, i.e., the polaron size increases with x tracking a dopant-induced transformation to metallic conductivity.…”

Section: Discussionmentioning

confidence: 99%

Optical properties of an interacting large polaron gas

1999

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The normal state conductivity, σ(ω), of a system of interacting large polarons is calculated within the Random Phase approximation and some numerical results are presented. The behaviour of the optical absorption as a function of the charge carrier density and of the temperature is analyzed for different values of the electron-phonon coupling constant. It is shown that σ(ω) exhibits features similar to those observed in the infrared spectra of the cuprates.71.38: polarons and electron-phonon interaction 1

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Section: Discussionmentioning

confidence: 99%

Optical properties of an interacting large polaron gas

1999

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“…Insulating SrTiO 3 has a perovskite structure and manifests a metal-insulator transition at room temperature around a doping of 0.002% La or Nb per unit cell [13]. At low doping concentrations, between 0.003% and 3%, strontium titanate reveals a superconducting phase transition [14] below 0.7 K. Various optical experiments [13,[15][16][17][18][19] show a mid-infrared band in the normal state optical conductivity of doped SrTiO 3 which is often explained by polaronic behavior. In the recently observed optical conductivity spectra of Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. [15], the experimental results of Ref. [18] on the temperature-dependent plasma frequencies in SrTi 1−x Nb x O 3 were interpreted within the theory of mixed polarons [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Many-body large polaron optical conductivity inSrTi1−xNbxO3

et al. 2010

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Recent experimental data on the optical conductivity of niobium doped SrTiO3 are interpreted in terms of a gas of large polarons with effective coupling constant α ef f ≈ 2. The theoretical approach takes into account many-body effects, the electron-phonon interaction with multiple LOphonon branches, and the degeneracy and the anisotropy of the Ti t2g conduction band. Based on the Fröhlich interaction, the many-body large-polaron theory provides an interpretation for the essential characteristics, except -interestingly -for the unexpectedly large intensity of a peak at ∼ 130 meV, of the observed optical conductivity spectra of SrTi1−xNbxO3 without any adjustment of material parameters.

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“…Different strength of electronphonon coupling in n-type SrTiO 3 and BaTiO 3 have been invoked to classify these materials into the large and small polaron categories, respectively. [4][5][6][7] The origin of the different nature of the electron-phonon interactions in these two compounds is not clear, however, especially considering very similar lattice constants and identical valence electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Doping and temperature-dependent optical properties of oxygen-reducedBaTiO3−δ

et al. 2010

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We report on optical properties of reduced BaTiO 3−δ at different doping levels including insulating and metallic samples. In all the samples, including metallic one, we observe structural phase transitions from the changes of the infrared active phonon modes. Metallic ground state is confirmed by the Drude-type low-frequency optical reflectance. Similar to SrTiO 3−δ we find that the mid-infrared absorption band in BaTiO 3−δ appears and grows with an increase in the oxygen vacancy concentration. Upon decrease in temperature from 300 K, the mid-infrared band shifts slightly to higher frequency and evolves into two bands: the existing band and a new and smaller band at lower frequency. The appearance of the new and smaller band seems to be correlated with the structural phase transitions.

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Explanation for the temperature dependence of plasma frequencies inSrTiO3using mixed-polaron theory

Cited by 37 publications

References 17 publications

Optical properties of an interacting large polaron gas

Optical properties of an interacting large polaron gas

Many-body large polaron optical conductivity inSrTi1−xNbxO3

Doping and temperature-dependent optical properties of oxygen-reducedBaTiO3−δ

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