Magnetic susceptibility χ and resistivity were measured in ${\mathrm{La}}_{2\mathrm{-}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{CuO}}_4$. Enhancement of χ due to a ferromagnetic correlation, which is inherent in the orthorhombic phase at low Sr concentrations, disappears at around x=0.05, near the margin of the superconducting regime. In superconducting samples with 0.1≲x≲0.2, χ exhibits a broad peak at a temperature ${\mathit{T}}_{\max }$. The T-dependent part of χ, ${\mathrm{\chi }}^{\mathit{s}}$(T), follows a single curve F regardless of x when ${\mathrm{\chi }}^{\mathit{s}}$ and T are normalized with the peak value ${\mathrm{\chi }}_{\max }^{\mathit{s}}$ and ${\mathit{T}}_{\max }$, as has been reported. However, the present scaling curve F decreases much more at T≪${\mathit{T}}_{\max }$ than the reported one. The resistivity exhibits a T-linear dependence above a temperature ${\mathit{T}}^{\mathrm{*}}$ and deviates downward from the T-linear dependence below ${\mathit{T}}^{\mathrm{*}}$. For x>0.1 the temperature ${\mathit{T}}^{\mathrm{*}}$ agrees well with ${\mathit{T}}_{\max }$, indicating that the deviation from a T-linear resistivity is related to the decrease of χ below ${\mathit{T}}_{\max }$. On the other hand, for x<0.1 a large reduction of χ is seen below ∼${\mathit{T}}^{\mathrm{*}}$ in the data up to 1000 K by Yoshizaki et al., although no peak is seen in the χ-T curve. The T dependence of χ in ${\mathrm{La}}_{2\mathrm{-}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{Cu}}_{1\mathrm{-}\mathit{y}}$${\mathrm{Zn}}_{\mathit{y}}$${\mathrm{O}}_4$ is also reported for x=0.16 and 0.22.

• Received 5 January 1994

DOI:https://doi.org/10.1103/PhysRevB.49.16000