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The in-plane magnetic field penetration depth (\lambda_{ab}) insingle-crystal La_{1.83}Sr_{0.17}CuO_4 was investigated by means of themuon-spin rotation (\muSR) technique. The temperature dependence of\lambda^{-2}_{ab} has an inflection point around 10-15K, suggesting thepresence of two superconducting gaps: a large gap (\Delta_1^d) with d-wave anda small gap (\Delta_2^s) with s-wave symmetry. The zero-temperature values ofthe gaps at \mu_0H=0.02T were found to be \Delta_1^d(0)=8.2(2)meV and\Delta_2^s(0)=1.57(8)meV.Comment: 5 pages, 3 figure

physical review letters

Experimental Evidence for Two Gaps in the High-Temperature<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mn>1.83</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>0.17</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>Superconductor

Experimental Evidence for Two Gaps in the High-TemperatureLa1.83Sr0.17CuO4Superconductor