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Dimensionality of the Cu-O double-chain site of PrBa2Cu4O8

We report measurements of the resistivity p, a-axis magnetoresistance Δρ a /ρ a and Hall coefficient R H of PrBa 2 Cu 4 O 8 (Pr124) single crystals. The in-plane anisotropy ρ a /ρ b in Pr124 is extremely large, reflecting thequasi-one-dimensional nature of the highly conducting Cu-O chains oriented along the b axis. Interchain resistivity, however, also shows metallic behavior below a peak at T= 140 K, where intriguingly, R H (T) has a minimum. Δρ a /ρ a (B//c) is large, positive and obeys Kohler's rule below 100 K. Moreover, the T dependence of square root of Δρ a /ρ a (T) follows closely that of Ichain(T) where lchain(T) is the mean-free-path of the carriers along the chain direction determined from ρ b (T). Collectively, these results prove the existence of a finite and coherent interchain charge transfer along the a-axis direction at low temperature, in the absence of mobile carriers within the CuO 2 planes.