Evidence for canted antiferromagnetism in lightly doped La1-xSrMnO3 - art.no. 144430

We present magnetization measurements on lightly doped La1-xSrxMnO3 single crystals with 0.06 less than or equal tox less than or equal to0.15 in exte rnal fields up to 14 T at temperatures between 4.2 and 180 K. In contrast t o the ferromagnetic behavior which is found for x greater than or equal to0 .11, the samples with x=0.06 and x=0.09 exhibit a pronounced hysteresis and a constant high-field susceptibility. By analyzing this particular behavio r we can rule out a phase separation into ferromagnetic and antiferromagnet ic regions. On the other hand, a model of a canted anti ferromagnet can acc ount for the main experimental features.