c-axis conductivity in the normal state of cuprate superconductors

2); (2) Faculty of Mathematics; A. Ramsak (1; I. Sega (1) ((1) J. Stefan Institute; Ljubljana; Physics; P. Prelovsek (1; Slovenia; Slovenia); University of Ljubljana

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c-axis conductivity in the normal state of cuprate superconductors

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arxiv cond-mat/9807315 v2 submitted 1998-07-23 cond-mat.str-el

P. Prelovsek (1 , 2) , A. Ramsak (1 , I. Sega (1) ((1) J. Stefan Institute , Ljubljana , Slovenia , (2) Faculty of Mathematics , Physics

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University of Ljubljana Slovenia)

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keywords c-axisconductivityinterlayerrelaxationresistivityanomalousappearsassuming

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The c-axis optical conductivity and d.c. resistivity are calculated within the t-J model assuming that the interlayer hopping is incoherent. Use is made of numerical results for spectral functions recently obtained with the finite-temperature Lanczos method for finite two-dimensional systems. In the optimally doped regime we find an anomalous relaxation rate, suggesting a common relaxation mechanism for intra- and interlayer transport. At low doping a pseudo-gap opening in the density of states appears to be responsible for a semimetallic-like behavior of d.c. resistivity.

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