Evidence for complex order parameter in La1.83Sr0.17CuO4
Abstract
The in-plane magnetic field penetration depth (λab) in single-crystal La1.83Sr0.17CuO4 was investigated by means of the muon-spin rotation (μSR) technique. The temperature dependence of λ-2ab has an inflection point around 10-15K, suggesting the presence of two superconducting gaps: a large gap (1d) with d-wave and a small gap (2s) with s-wave symmetry. The zero-temperature values of the gaps at μ0H=0.02T were found to be 1d(0)=8.2(2)meV and 2s(0)=1.57(8)meV.
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