Abstract
The temperature dependences of the real part R s and the imaginary part X s of the surface impedance Z s =R s +iX s of the superconductor Ba0.6K0.4BiO3 (T c ≃30 K) are measured at a frequency of 9.4 GHz. Its temperature dependence Z s (T) and that of the complex conductivity σ s (T) can be described on the basis of a two-fluid model under two assumptions: The density of superconducting carriers increases linearly, and the relaxation time increases as a power law (∝1/T 5), with decreasing temperature T<T c . This model also describes well the curves Z s (T) and σs (T) recently measured for YBa2Cu3O6.95 and Bi2Sr2CaCu2O8 single crystals.
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Pis’ma Zh. Éksp. Teor. Fiz. 64, No. 11, 783–788 (10 December 1996)
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Trunin, M.R., Zhukov, A.A., Tsydynzhapov, G.É. et al. Linear low-temperature dependence of the surface impedance of a Ba0.6K0.4BiO3 single crystal. Jetp Lett. 64, 832–838 (1996). https://doi.org/10.1134/1.567255
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DOI: https://doi.org/10.1134/1.567255