Normal state properties of lithiated YBa2Cu3O7−x samples

Abstract

Measurements of the resistivity in the normal state of lithiated YBa2Cu3O7−x are reported. At low xLi-values (<0.06), lithium substitutes copper of the CuO2 planes. The samples are metallic; a progressive localization of the charge carriers is observed. In the intermediate concentration range, lithium occupies both copper sites planes and chains which leads to a two-phased system; the slope dϱ/dT is nearly independent of temperature. In the concentrated range, lithium is in the chain site. The resistivity behaviour is well described by the simple relation $$\rho = \frac{{\rho _0 T_0 }}{T}$$ with ρ0T0=10Ω.cm.K, a result which is consistent with a single YBCO6-type phase.