Crossover behavior of in-plane and out-of-plane resistivity in La2-xSrxCuO4

We report that the in-plane (rho(ab)) and out-of-plane (rho(c)) resistivity of La214 deviate downward and upward from linear extrapolations of their h igh-T data below a certain temperature T*, respectively, which are very sim ilar to the crossover behaviors of rho(ab) and rho(c) arising from the pseu dogap formations in Y123 and Bi2212. The crossover behavior of resistivity in La214 occurs around T* similar to T-co = 2 Delta(o)/4.3 k(B) as in Bi221 2, where 2 Delta(o) is the superconducting gap magnitude at T much less tha n T-c. These results suggest that a pseudogap may open up below T* similar to T-co also in La214, although it has not been observed in microscopic exp eriments on La214. (C) 1999 Elsevier Science B.V. All rights reserved.