Abstract
The results of low-temperature normal-state resistivity measurements of La 2−xSr xCuO 4 (LSCO) and Bi 2Sr 2−xLa xCuO y (Bi-2201) using 61-T pulsed magnetic fields are summarized. Measurements of LSCO with various Sr doping reveal (1) an insulator-to-metal crossover in the normal state that takes place near optimum doping and (2) unusual log(1/ T) divergence of both ϱ ab and ϱ c of insulating underdoped samples. In particularly clean Bi-2201 crystals, metallic in-plane resistivity and insulating c-axis resistivitiy are found to coexist down to the lowest experimental temperature. Recent measurements of the low-temperature normal-state Hall effect on Bi-2201 find an essentially temperature-independent Hall coefficient below 20 K, which suggest that the unusual insulating behavior does not come from conventional disorder-enhanced electron interactions.
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