Abstract
The magnetic state in the ${\mathrm{La}}_{1.85\ensuremath{-}2x}{\mathrm{Sr}}_{0.15+2x}{\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}{\mathrm{O}}_{4}(0<~x<~0.5)$ system has been studied. The diamagnetism persists at 37 K in $x<~0.06$ samples. It is found that a slight doping of Mn ions induces a spin-compensated state on some length scale and decreases the Meissner volume. The spin-compensated state overwhelms the superconductivity at the doping level $0.1<~x<~0.32.$ When $x>0.32,$ the paramagnetism observed is compatible with double-exchange interactions.
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