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Infrared reflectivity measurements, using p-polarized light at a grazingangle of incidence, show an increased sensitivity to the optical conductivityof highly reflecting superconducting materials. We demonstrate that when thismeasurement technique is applied to the conventional s-wave superconductor NbN,the results are in perfect agreement with BCS theory. For the in-plane responseof a La$_{1.85}$Sr$_{0.15}$CuO$_4$ single crystal, in the superconductingstate, we find a reduction of the optical conductivity in the frequency rangebelow 20 meV. The observed frequency dependence excludes an isotropic s-wavegap, but agrees well with model calculations assuming a d-wave order parameter.Comment: submitted to phys rev letters, 4 pages, 3 figures in postscrip

physical review letters

Grazing Incidence Infrared Reflectivity of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>1.85</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.15</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><…

Grazing Incidence Infrared Reflectivity ofLa1.85Sr0.15CuO<…