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The reflectivity $R (\omega)$ of both the $ab$ plane and the c axis of twosingle crystals of La$_{1.875}$Ba$_{0.125-y}$Sr$_{y}$CuO$_4$ has been measureddown to 5 cm$^{-1}$, using coherent synchrotron radiation below 30 cm$^{-1}$.For $y$ = 0.085, a Josephson Plasma Resonance is detected at $T \ll T_c$ = 31 Kin $R_{c} (\omega)$, and a far-infrared peak (FIP) appears in the opticalconductivity below 50 K, where non-static charge ordering (CO) is reported byX-ray scattering. For $y$ = 0.05 ($T_c$ = 10 K), a FIP is observed in thelow-temperature tetragonal phase below the ordering temperature $T_{CO}$. At1/8 doping the peak frequency scales linearly with $T_{CO}$, confirming thatthe FIP is an infrared signature of CO, either static or fluctuating.Comment: v2: longer version, 9 pages, 6 color figure

physical review. b, condensed matter and materials physics

Effects of superconductivity and charge order on the subterahertz reflectivity of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mn>1.875</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ba</mml:mi><mml:mrow><mml:mn>0.125</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mi>y</mml:mi></mml:msub><mml:mi mathvariant="normal">Cu…

Effects of superconductivity and charge order on the subterahertz reflectivity ofLa1.875Ba0.125−ySryCu…