Abstract
The positive muon (μ +) spin relaxation has been measured for single crystal samples of the oxide superconductor (La 1− x Sr x ) 2CuO 4− δ under zero applied field. For x = 0.04 sample, it is found that both the μ + initial polarization and the relaxation rates do not show any changes at around the superconducting transition temperature (T c ≌ 11 K) , while they show a dramatic change at the temperature ∼5 K, indicating an existence of a magnetic transition in the superconducting state. It is found that a similar transition also occurs for x = 0.02 sample, suggesting an existence of a magnetic phase at low temperatures and at the low Sr concentration region.
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