INFRARED REFLECTION OF EPITAXIAL TL2BA2CACU2O8 THIN FILMS IN THE NORMAL AND SUPERCONDUCTING STATES
作者： C.M. Foster , K.F. Voss , T.W. Hagler , D. Mihailović , A.J. Heeger
DOI: 10.1016/0038-1098(90)90108-N
关键词: Chemistry 、 Superconductivity 、 Analytical chemistry 、 Optical conductivity 、 Band gap 、 Penetration depth 、 Oscillator strength 、 High-temperature superconductivity 、 Effective mass (solid-state physics) 、 Inorganic compound
摘要: Abstract For T>T c , the frequency-dependent conductivity, σ(ω), is Drude-like in far-infrared (IR) and indicates a broad absorption mid-IR. T R S (ω)=1.0±0.005 for ω −1 . All normal state Drude oscillator strength shifts to δ(ω), but with no shift or loss of from No feature (ω) σ(ω) can be assigned energy gap. The penetration depth (λ L ) carrier density condensate (N are λ ≈2000A N ≈4.5X10 20 (m ∗ /m) cm −3 m optical effective mass free-electron mass). data demonstrate that quality these epitaxial Tl 2 Ba CaCu O 8 films comparable best YBa Cu 3 7-δ films.
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