Evidence for complex order parameter in La_{1.83}Sr_{0.17}CuO_4

Abstract

The in-plane magnetic field penetration depth (λ_{ab}) in single-crystal La_{1.83}Sr_{0.17}CuO_4 was investigated by means of the muon-spin rotation (\muSR) technique. The temperature dependence of λ^{-2}_{ab} has an inflection point around 10-15K, suggesting the presence of two superconducting gaps: a large gap (Δ_1^d) with d-wave and a small gap (Δ_2^s) with s-wave symmetry. The zero-temperature values of the gaps at μ_0H=0.02T were found to be Δ_1^d(0)=8.2(2)meV and Δ_2^s(0)=1.57(8)meV.

5 pages, 3 figures

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