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Determination of the optical properties of La<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>Ba<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mi>x</mml:mi></mml:msub></mml:math>CuO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:…
The optical properties of single crystals of the high-temperature superconductor La${}_{2\ensuremath{-}x}$Ba${}_{x}$CuO${}_{4}$ have been measured over a wide frequency and temperature range for light polarized in the a-b planes and along the $c$ axis. Three different Ba concentrations have been examined, $x=0.095$ with a critical temperature ${T}_{c}=32$ K, $x=0.125$ where the …