Optical study of plasmons inTl2Ba2

I I Boovic

¹

,

Jae‐Hun Kim

²

,

Jr Js Harris

³

et al.

Temperature and magnetic field effects on the carrier density and Hall mobility of boron-doped Tl–Ba–Ca–Cu–O superconductor

“…The latter optical phonon corresponds to the vibration along the c-axis of the oxygen atoms in the BaO planes and the Ca atoms against the oxygen atoms in the central CuO planes. In addition, the optical studies of plasmons in Tl-2223 [27] thin films have also shown that the plasmon spectrum consists of an optical plasmon at 1.2 eV and a broad band of acoustic plasmons around 1.0 eV.…”

“…To compute the acoustic phonons scattering mobility, the value of the average atomic volume (2.66 × 10 −22 cm 3 ) and the density (6.96 g/cm 3 ) were calculated using our XRD data. The Debye temperature being 24 K was obtained from Lindemann's melting rule by measuring the melting temperature of the sample as 1323 K and the acoustic phonons deformation potential was taken as 1.0 eV as observed through IR measurements [25,27]. By using these experimental values, the only fitting parameter in Eq.…”

Probing the bulk plasmon continuum of layered materials through electron energy loss spectroscopy in a reflection geometry

“…With an eye toward the high-T C cuprate superconductors, the approximations used in section I may not be as limiting as one might expect; e.g., in [42], Bi-2212 (a ≈ 12.3 Å and l ≈ 3.2 Å [46]) was investigated within a dielectric model of conducting layers. In Bi-2212 [12,47,48] and Bi-2201 [12], HREELS measurements at long wavelengths have observed a broad responsei.e., broader than the plasmon peak in Bi-2212 inferred via optical means [12,[49][50][51] -across energies below the (bulk) optical plasma frequency. Unfortunately, the low energies of incident electrons in these HREELS experiments skews the spectrum at long wavelengths, rendering the precise surface loss function difficult to extract from an experimental intensity [12,52,53].…”

Spectral weight and thermodynamic properties of YBa2Cu3O6+xthin films

“…It has been argued, relying essentially on the experimental observation that the frequency dependence of Im (−1/ε) is quadratic, that non-Drude behaviour may be characteristic of a layered electron gas [20,21].…”