Mid-infrared conductivity from mid-gap states associated with charge stripes

@article{Homes2003MidinfraredCF,
  title={Mid-infrared conductivity from mid-gap states associated with charge stripes},
  author={Christopher C. Homes and John M. Tranquada and Q. Li and Arnie. R. Moodenbaugh and Douglas J. Buttrey},
  journal={Physical Review B},
  year={2003},
  volume={67},
  pages={184516}
}
15 , a material in which the charge stripes order three dimensionally. We show that the conductivity can be decomposed into two components, a mid-infrared peak that we attribute to transitions from the filled valence band into empty mid-gap states associated with the stripes, and a Drude peak that appears at higher temperatures as carriers are thermally excited into the mid-gap states. The shift of the mid-IR peak to lower energy with increasing temperature is explained in terms of the Franck… 

Figures from this paper

Modelling Cuprate Gaps in a Composite Two-Band Model
A simple model to cover the two-component scenario of cuprate superconductivity is developed. Interband pairing interaction acts between itinerant and defect states created by doping. Two defect
Ultrafast mid-infrared spectroscopy of the charge- and spin-ordered nickelates
We discuss the mid-infrared optical response of a charge and spin-ordered nickelate in the ultrafast time domain. A strong photo-induced modulation of the optical reflectivity is observed on the
OPTICAL CONDUCTIVITY OF OXIDES
Optical conductivity spectra of conducting oxides including high-TC cuprates - compared to non-superconducting nickelates in particular - deduced from infrared reflectivity spectroscopy in polarized
Ultrafast dynamics of the mid-infrared pseudogap in stripe-phase La1.75Sr0.25NiO4
We present the first ultrafast mid-infrared study of charge and spin-ordered nickelates. A multi-component dynamics is observed, evidencing the femtosecond decay and formation of the low-energy
MULTIBAND MODEL OF CUPRATE SUPERCONDUCTIVITY
A minimal model for the description of cuprate superconductor characteristics on doping scale (hole and electron) is developed. The leading interband pairing channel couples an itinerant band and
Ultrafast Mid-infrared Spectroscopy of the Charge- and Spin-Ordered Nickelate La1.75Sr0.25NiO4
We present the first ultrafast mid-infrared study of charge and spin-ordered nickelates. A sub-picosecond modulation of the optical reflectivity is observed, indicating the filling and subsequent
Relation between Thermally Induced Structural Distortions and Electronic Properties of the Layered Misfit Chalcogenide (LaS)1.196VS2
Interplay between electronic and structural properties of the misfit layered chalcogenide (LaS)1.196VS2 crystals was investigated by transport, optical measurements, angle-resolved photoemission
Direct observation of dynamic charge stripes in La2-xSrxNiO4.
TLDR
The detection of critical lattice fluctuations, driven by charge-stripe correlations, in La2-xSrxNiO4 using inelastic neutron scattering is reported, which opens the way towards the quantitative theory of dynamic stripes and for directly detecting dynamical charge stripes in other strongly correlated systems, including high-temperature superconductors such as La 2-x SrxCuO4.
...
1
2
3
4
...

References

SHOWING 1-10 OF 50 REFERENCES
Anomalous optical absorption in the normal state of overdoped cuprates near the charge-ordering instability.
TLDR
It is argued that the hump observed in the optical conductivity at or below a few hundreds of cm(-1), in overdoped cuprates such as the electron-doped Nd(2-x)Ce(x)CuO(4-y) at x > or approximately equal to 0.15, cannot be accounted for within a single-fluid description.
Dynamics of metallic stripes in cuprates.
TLDR
The dynamics of metallic vertical stripes in cuprates within the three-band Hubbard model based on a recently developed time-dependent Gutzwiller approximation shows softening related to the quasidegeneracy between Cu-centered and O-centered mean-field stripe solutions close to optimal doping.
Stripe structure, spectral feature and soliton gap in high Tc cuprates
We show that lightly doped La 2- x Sr x CuO 4 can be described in terms of a stripe magnetic structure or soliton picture. The internal relationship between the recent neutron observation of the
Signature of stripes in the optical conductivity of La 2 NiO 4.11
The temperature dependence of the infrared reflectivity spectra of a single crystal of La 2 NiO 4 + Φ , with an oxygen excess δ = 0.11, is analyzed by both Kramers-Kronig analysis and an attempt to
Stripe conductivity in La1.775Sr0.225NiO4
TLDR
Raman light-scattering and optical conductivity measurements on a single crystal of La1.775Sr0.225NiO4 which exhibits incommensurate charge-stripe order provide clear evidence for finite dynamical conductivity within the charge stripes.
Optical conductivity of c axis oriented YBa2Cu3O6.70: Evidence for a pseudogap.
TLDR
The c axis reflectance of high-quality single crystals of YBa 2 Cu 3 O 6-x has been measured over a wide range of temperatures and frequencies and observations are consistent with phase diagrams proposed to explain NMR and neutron data.
Mobility of the doped holes and the antiferromagnetic correlations in underdoped high- Tc cuprates.
TLDR
An incoherent-metal picture and a charged-stripe scenario are discussed as candidates to account for these peculiar features of the metallic charge transport in the La2-xSrxCuO4 system.
Electromagnetic response of static and fluctuating stripes in cuprate superconductors.
TLDR
Neither superconductivity nor static stripe ordering has a noticeable effect on the depression of the scattering rate at omega<1000 cm(-1) characteristic of the pseudogap state in other classes of moderately doped cuprates.
Optical conductivity studies of La 3/2 Sr 1/2 NiO 4 : Lattice effect on charge ordering
Optical conductivity spectras(v) of a La3/2Sr1/2NiO4 single crystal were investigated over a wide photon energy range with variations of temperature and polarization. Strong anisotropies in phonon
Distribution of spectral weight in a system with disordered stripes
The "band structure" of a disordered stripe array is computed and compared, at a qualitative level, to angle-resolved photoemission experiments on cuprate high-temperature superconductors. The
...
1
2
3
4
5
...