MAGNETIC DEPAIRING IN HIGHLY-DOPED LA2CUO4

The magnetic susceptibility-chi of La2-xSrxCuO4 was measured in the range x congruent-to 0.06 to 0.3. The T-dependent part chi-s(T) of chi below x congruent-to 0.18 consists of a term chi-F(s)(T) arising from antiferromagnetically correlated Cu-spins, while chi-s(T) above x congruent-to 0.18 consists of chi-F(s)(T) and a Curie term which is small but grows with increasing x. The superconducting transition temperature decreases rapidly with increasing x above x congruent-to 0.18 where the Curie term appears.