LOGARITHMIC DIVERGENCE OF BOTH INPLANE AND OUT-OF-PLANE NORMAL-STATE RESISTIVITIES OF SUPERCONDUCTING LA2-XSRXCUO4 IN THE ZERO-TEMPERATURE LIMIT

The low-temperature normal-state resistivities of underdoped La2-xSrxC uO4 crystals with T-c of 20 and 35 K were studied by suppressing the s uperconductivity with pulsed magnetic fields of 61 T. Both in-plane re sistivity rho(ab) and out-of-plane resistivity rho(c) are found to div erge logarithmically as T/T-c --> 0. Logarithmic divergence is accompa nied by a nearly constant anisotropy ratio, rho(c)/rho(ab), suggesting an unusual three-dimensional insulator.