Details
| Original language | English |
|---|---|
| Pages (from-to) | 889-904 |
| Number of pages | 16 |
| Journal | Physica Status Solidi (B) Basic Research |
| Volume | 198 |
| Issue number | 2 |
| Publication status | Published - Dec 1996 |
Abstract
The room temperature transmission and reflection behaviour of misfit layer compounds (MLCs) (MS)nTS2 (T = Nb, Ta; M = Pb, Sm, Tb) were investigated in the spectral range between 1000 and 20000 cm-1 for incident light normal to the layered structure (k ⊥ (001)). A characteristic near infrared transmission window (TW) is observed between the Drude free carrier threshold (4000 cm-1 < w0 < 6000 cm-1) and the onset of stronger interband transitions (above 13000 cm-1). Evaluations of the absorption profiles show an interband absorption superimposed on the free carrier absorption in the TW which are related to transitions involving states in the conduction band (or conduction bands). Values of w0 are found to be slightly smaller for E ∥ b compared to E ∥ a (parallel to the incommensurate direction) polarized spectra for all compounds under study. This effect is interpreted in terms of slightly smaller effective masses for the optical conductivity for the E ∥ a components. The temperature dependence (213 to 423 K) of the free carrier reflectivity for (PbS)1.13TaS2 shows a linear increase of the damping parameter with temperature both for E ∥ a and E ∥ b. This is suggested to be due to ordinary electron-phonon scattering of the free carriers. Reflection spectra for E ∥ c indicate w0 values of about 1500 cm-1 for (SmS)1.19TaS2 ((TbS)1.21NbS2) and below 1300 cm-1 for (PbS)1.13TaS2 ((PbS)1.21NbS2).
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physica Status Solidi (B) Basic Research, Vol. 198, No. 2, 12.1996, p. 889-904.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Optical reflectivity and transmissivity of misfit layer compounds (MS)nTS2 (T = Ta, Nb; M = Pb, Sm, Tb; 1.08 < n < 1.23)
AU - Rüscher, C. H.
PY - 1996/12
Y1 - 1996/12
N2 - The room temperature transmission and reflection behaviour of misfit layer compounds (MLCs) (MS)nTS2 (T = Nb, Ta; M = Pb, Sm, Tb) were investigated in the spectral range between 1000 and 20000 cm-1 for incident light normal to the layered structure (k ⊥ (001)). A characteristic near infrared transmission window (TW) is observed between the Drude free carrier threshold (4000 cm-1 < w0 < 6000 cm-1) and the onset of stronger interband transitions (above 13000 cm-1). Evaluations of the absorption profiles show an interband absorption superimposed on the free carrier absorption in the TW which are related to transitions involving states in the conduction band (or conduction bands). Values of w0 are found to be slightly smaller for E ∥ b compared to E ∥ a (parallel to the incommensurate direction) polarized spectra for all compounds under study. This effect is interpreted in terms of slightly smaller effective masses for the optical conductivity for the E ∥ a components. The temperature dependence (213 to 423 K) of the free carrier reflectivity for (PbS)1.13TaS2 shows a linear increase of the damping parameter with temperature both for E ∥ a and E ∥ b. This is suggested to be due to ordinary electron-phonon scattering of the free carriers. Reflection spectra for E ∥ c indicate w0 values of about 1500 cm-1 for (SmS)1.19TaS2 ((TbS)1.21NbS2) and below 1300 cm-1 for (PbS)1.13TaS2 ((PbS)1.21NbS2).
AB - The room temperature transmission and reflection behaviour of misfit layer compounds (MLCs) (MS)nTS2 (T = Nb, Ta; M = Pb, Sm, Tb) were investigated in the spectral range between 1000 and 20000 cm-1 for incident light normal to the layered structure (k ⊥ (001)). A characteristic near infrared transmission window (TW) is observed between the Drude free carrier threshold (4000 cm-1 < w0 < 6000 cm-1) and the onset of stronger interband transitions (above 13000 cm-1). Evaluations of the absorption profiles show an interband absorption superimposed on the free carrier absorption in the TW which are related to transitions involving states in the conduction band (or conduction bands). Values of w0 are found to be slightly smaller for E ∥ b compared to E ∥ a (parallel to the incommensurate direction) polarized spectra for all compounds under study. This effect is interpreted in terms of slightly smaller effective masses for the optical conductivity for the E ∥ a components. The temperature dependence (213 to 423 K) of the free carrier reflectivity for (PbS)1.13TaS2 shows a linear increase of the damping parameter with temperature both for E ∥ a and E ∥ b. This is suggested to be due to ordinary electron-phonon scattering of the free carriers. Reflection spectra for E ∥ c indicate w0 values of about 1500 cm-1 for (SmS)1.19TaS2 ((TbS)1.21NbS2) and below 1300 cm-1 for (PbS)1.13TaS2 ((PbS)1.21NbS2).
UR - http://www.scopus.com/inward/record.url?scp=0041113754&partnerID=8YFLogxK
U2 - 10.1002/pssb.2221980234
DO - 10.1002/pssb.2221980234
M3 - Article
AN - SCOPUS:0041113754
VL - 198
SP - 889
EP - 904
JO - Physica Status Solidi (B) Basic Research
JF - Physica Status Solidi (B) Basic Research
SN - 0370-1972
IS - 2
ER -