Abstract
Anisotropic electrical resistivity and magnetic susceptibility are measured on single crystals of ${\mathrm{Sr}}_{14\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{A}}_{\mathrm{x}}$${\mathrm{Cu}}_{24}$${\mathrm{O}}_{41}$ (A = Ca, Y). This material contains two-leg antiferromagnetic spin ladders that are progressively doped with hole carriers upon Ca substitution and thus determine the charge-transport properties. Application of hydrostatic pressure to this system has an effect similar to Ca substitution, increasing the hole density in the ladders. The resistivity shows remarkable anisotropy, indicative of a one-dimensional electronic state.
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