nd - m at . s up r - co n ] 2 6 A ug 1 99 9 Universal relationship between the penetration depth and the normal - state conductivity in YBaCuO
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چکیده
Universal relationship between the penetration depth and the normal-state conductivity in YBaCuO. Abstract The absolute values of the conductivity in the normal state σ n and of the low temperature penetration depths λ(0) were measured for a number of different samples of the YBaCuO family. We found a striking correlation between σ n and λ −2 regardless of doping, oxygen reduction or defects, thus providing a simple method to predict the superconducting penetration depth and to have an estimate of the sample quality by measuring the normal-state conductivity. The superconducting penetration depth, λ(0), is one of the most important electrody-namic properties of the high-temperature superconductors and provides direct information about the spectral weight of the superconducting condensate [1]. In the normal state the low frequency electrodynamics can be characterized by the absolute value of the conductivity σ n (ν, T). At not too high frequencies, σ n (ν, T) is in a good approximation a real function of frequency. Because λ(0) and σ n (0, T) both involve a Fermi-surface averaging and depend on the same amplitude factors e 2 N(0)υ 2 F [2], they may be expected to be connected to each other. In order to investigate possible correlations experimentally, we have carried out 1
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تاریخ انتشار 1999