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To elucidate how the temperature dependence of the resistivity anisotropy ofthe cuprate superconductors changes with hole doping, both the in-plane and theout-of-plane resistivities (\rho_{ab} and \rho_{c}) are measured in a series ofhigh-quality Bi_{2}Sr_{2-x}La_{x}CuO_{6+\delta} (BSLCO) single crystals for awide range of x (x = 0.23 - 1.02), which corresponds to the hole doping per Cu,p, of 0.03 - 0.18. The anisotropy ratio, \rho_{c}/\rho_{ab}, shows a systematicincrease with decreasing p at moderate temperatures, except for the mostunderdoped composition where the localization effect enhances \rho_{ab} andthus lowers \rho_{c}/\rho_{ab}. The exact p dependence of \rho_{c}/\rho_{ab} ata fixed temperature is found to be quite peculiar, which is discussed to be dueto the effect of the pseudogap that causes \rho_{c}/\rho_{ab} to beincreasingly more enhanced as p is reduced. The pseudogap also causes a rapidgrowth of \rho_{c}/\rho_{ab} with decreasing temperature, and, as a result, the\rho_{c}/\rho_{ab} value almost reaches 10^6 in underdoped samples just aboveT_c. Furthermore, it is found that the temperature dependence of \rho_{c} ofunderdoped samples show two distinct temperature regions in the pseudogapphase, which suggests that the divergence of \rho_{c} below the pseudogaptemperature is governed by two different mechanisms.Comment: 10 pages, 10 figures, revised version. Discussions are expanded with  a new analysis of the T-dependence of \rho_{c} and the resulting new phase  diagra

physical review. b, condensed matter

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Evolution of the resistivity anisotropy inBi2Sr2−xLa