Abstract
We have investigated the effect of the impurity scattering due to a small amount of oxygen defect, δ (δ < 0.01) on the anisotropic resistivity of La 2−x Sr x CuO 4−δ in a wide x range up to x = 0.26. In the superconducting region with 0.06 ≤ x ≤ 0.22, we found that impurity scattering by the oxygen defect remarkably decreases the c-axis resistivity ρc over the whole temperature range. The finding is interpreted in terms of the nonmetallic conduction along the c axis which is enhanced by scattering the confined carriers in the CuO 2 plane. On the other hand, the enhancement of the c-axis conduction diminishes in the nonsuperconducting region. This is consistent with the two-dimensional nature of the electronic state which stabilizes the superconducting ground state in the cuprates.
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Kikugawa, N., Hori, J., Nakamura, F. et al. Impurity scattering effect on the anisotropic resistivity for La2−x Sr x CuO4−δ with a wide range of x . Journal of Low Temperature Physics 117, 1139–1143 (1999). https://doi.org/10.1023/A:1022551129389
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DOI: https://doi.org/10.1023/A:1022551129389