Structural, magnetic, and transport properties of La2Cu1-xLixO4

Li substitutes for Cu in La2CuO4 up to the limiting stoichiometry La2Cu0.5Li0.5O4, which has superstructure order. The effects of this in-plane hole doping on the structural and magnetic properties of La2CuO4 are very similar to those due to Sr substitution. The tetragonal-orthorhombic structural phase transition occurs, for a given amount of Sr or Li, at nearly the same temperature, and the in-plane lattice constant of La2-ySryCu1-xLixO4 at room temperature depends only on the combined hole count (x+y) and not on the individual Sr or Li concentration. Long-range magnetic order is destroyed upon substituting 3% Li for Cu, analogous to the effect of Sr substitution on TNacuteeel. However, the holes introduced by Li substitution are bound. The resistivity as a function of temperature is nonmetallic for all Li concentrations. copyright 1996 The American Physical Society