Observation of a midinfrared band 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:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="italic">y</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

Calvani, P.; Capizzi, M.; Donato, Filippo; Lupi, S.; Maselli, P.; Peschiaroli, D.

doi:10.1103/physrevb.47.8917

Cited by 103 publications

(68 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…2͑c͒ and 3͑b͔͒. The strength of this absorption is known to scale with the charge carrier concentration [14][15][16] and was thus consistent with the electrical conductivity of the crystals. In addition, an absorption peak at 2.92 eV ͑424 nm͒ was observed ͓see Fig.…”

Section: -13mentioning

confidence: 85%

Effects of hydrogen anneals on oxygen deficient SrTiO3−x single crystals

Jalan

Engel‐Herbert

Mates

et al. 2008

Applied Physics Letters

View full text Add to dashboard Cite

The influence of hydrogen gas anneals on the electrical properties of nominally undoped, oxygen-deficient SrTiO3−x single crystals was investigated. Titanium getter layers and vacuum anneals were used to obtain oxygen-deficient SrTiO3−x with a low electrical resistivity. These crystals showed an optical absorption peak at 2.92 eV and strong midinfrared absorption. Subsequent anneals at 800 °C in forming gas, which contained 10% hydrogen, returned the crystals into the insulating, transparent state. The mechanisms by which hydrogen anneals can compensate for the effects of oxygen vacancies in SrTiO3−x are discussed. The results show that forming gas anneals of stoichiometric SrTiO3 can lead to complex electrical conduction behavior.

show abstract

Section: -13mentioning

confidence: 85%

Effects of hydrogen anneals on oxygen deficient SrTiO3−x single crystals

Jalan

Engel‐Herbert

Mates

et al. 2008

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…Literature values of the SrTiO 3 effective mass range between 1.1m 0 and 13m 0 . 32,39,40,[43][44][45] Relying on the assumption that for SrTiO 3 m ef f cannot be realistically smaller that the free-electron value, we extract upper limit values for the thickness, corresponding to the lower limit value of the effective mass m ef f Ϸ 1.1m 0 . Using the 3D approach, we obtain that the conducting interface is thinner than t max Ϸ 25 nm while using the 2D approach we get t max Ϸ 40 nm; the latter value corresponds to 12 occupied energy levels.…”

Section: Resultsmentioning

confidence: 99%

Seebeck effect in the conductingLaAlO3/SrTiO3interface

Pallecchi¹,

Codda²,

d’Agliano³

et al. 2010

Phys. Rev. B

View full text Add to dashboard Cite

The observation of metallic behavior at the interface between insulating oxides has triggered worldwide efforts to shed light on the physics of these systems and clarify some still open issues, among which the dimensional character of the conducting system. In order to address this issue, we measure electrical transport ͑Seebeck effect, Hall effect, and conductivity͒ in LaAlO 3 / SrTiO 3 interfaces and, for comparison, in a doped SrTiO 3 bulk single crystal. In these experiments, the carrier concentration is tuned, using the field effect in a back-gate geometry. The combined analysis of all experimental data at 77 K indicates that the thickness of the conducting layer is ϳ7 nm and that the Seebeck-effect data are well described by a two-dimensional density of states. We find that the back-gate voltage is effective in varying not only the charge density but also the thickness of the conducting layer, which is found to change by a factor of ϳ2, using an electric field between −4 and +4 MV/ m at 77 K. No enhancement of the Seebeck effect due to the electronic confinement and no evidence for two-dimensional quantization steps are observed at the interfaces.

show abstract

“…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%

Many-body large polaron optical conductivity inSrTi1−xNbxO3

et al. 2010

View full text Add to dashboard Cite

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.

show abstract

Observation of a midinfrared band inSrTiO3−y

Cited by 103 publications

References 44 publications

Effects of hydrogen anneals on oxygen deficient SrTiO3−x single crystals

Effects of hydrogen anneals on oxygen deficient SrTiO3−x single crystals

Seebeck effect in the conductingLaAlO3/SrTiO3interface

Many-body large polaron optical conductivity inSrTi1−xNbxO3

Contact Info

Product

Resources

About