Abstract
The fluctuation-induced conductivity measured on YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}-PrBa{sub 2}Cu{sub 3}O{sub 7-{delta}} superlattices (SL) is analyzed using various theoretical models describing weak fluctuations in layered superconductors and considering both Aslamazov-Larkin (AL) and Maki-Thompson (MT) terms. From the analysis {xi}{sub c}(0)=1.6{plus_minus}0.1 {Angstrom} and {tau}{sub {phi}}(100 K){approx_equal}3{times}10{sup {minus}13} s in clean limit are derived for the interlayer coherence length and temperature-dependent phase-relaxation time, respectively. Large {tau}{sub {phi}} values and AL-MT crossover revealed for all samples studied are attributed to the two-dimensional electronic state nature of SL above the crossover temperature. Possible mechanisms of charge scattering in high-T{sub c} superconductors are also discussed. {copyright} {ital 1997} {ital The American Physical Society}
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