Effects of isovalent substitution and pressure on the interplane resistivity of single-crystal Ba(Fe1-xRux)2As2

Temperature-dependent interplane resistivity rho(c)(T) was measured in an isovalent substituted iron-arsenide compound Ba(Fe1-xRux)(2)As-2 over a substitution range from parent compound to slightly below optimal doping x = 0.29. The feature of interest in the rho(c)(T), a broad resistivity crossover maximum found in the parent compound at T-max approximate to 200 K, shifts to higher temperatures with Ru substitution, similar to 340 K for x = 0.161 and goes out of the 400 K range for x = 0.29. Nearly T-linear dependence of interplane resistivity is found at the highest substitution level x = 0.29. This temperature-dependent rho(c) and its evolution with substitution bear close similarity to another type of isovalent substituted system BaFe2(As1-xPx)(2). Similarly to the isovalent substitutions, the measurements of interplane resistivity in the parent BaFe2As2 compound under pressures up to 20 kbar also revealed a rapid rise in T-max.