Antiferromagnetic correlations versus superfluid density in La2−xSrxCuO4

Authors have performed muon spin relaxation and low field ac-susceptibility measurements in a series of high quality samples of La2-xSrxCuO4 (x = 0.08-0.24) as a function of temperature. Superconductivity coexists with low temperature spin glass order up to the optimally doped region where the normal state pseudogap also closes. The systematic depletion of superfluid density with the enhancement of aniferromagnetic correlations with underdoping indicates a competition between antiferromagnetic correlations and superconductivity. 8 refs.