Abstract
We study the temperature ( T) dependence of magnetic penetration depth λ( T) from microwave surface impedance measurements in single crystals of Bi 2Sr 2CaCu 2O 8+ y with various oxygen contents. At relatively low oxygen content, both the in-plane ( λ ab ( T)) and out-of-plane ( λ c ( T)) penetration depths show the T-linear behavior at low temperatures, consistent with a clean d-wave superconductor. In contrast, overdoped samples exhibit T 2 dependence of λ ab ( T) and λ c ( T). This strongly suggests that the quasiparticle excitation spectrum changes into that of a gapless state with oxygen doping.
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