Abstract
The resistivity ρ(100 K) scatters very much for YBa2Cu3Ox prepared as single crystals, epitaxial films or bulk samples which consist of grains of 1 to 10 μm diameter. An analysis of ρ(T) for granular bulk samples is presented indicating the existence of a low intrinsic resistivity ρi(T)=ρ i0L +αi T with ρ i0L ≈0 and αi≃0.5µΩcm/K. The large grain boundary resistivity ρ b between the grains (>1 μm) yield a macroscopic percolative conduction path lengtheningL/L 0>1 with a reduced effective cross sectionC<C 0 and thus, ρ(T)=Σρ b +(LC 0/L 0 C)·ρi(T). Evidence is presented for weak links inside single crystals and grains.
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Halbritter, J., Dietrich, M.R., Küpfer, H. et al. Analysis of the dc-resistivity of YBa2Cu3Ox: Deduction of the intragrain resistivity. Z. Physik B - Condensed Matter 71, 411–413 (1988). https://doi.org/10.1007/BF01313925
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DOI: https://doi.org/10.1007/BF01313925