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We present results of magnetic neutron diffraction experiments on theco-doped super-oxygenated La(2-x)Sr(x)CuO(4+y) (LSCO+O) system with x=0.09. Thespin-density wave has been studied and we find long-range incommensurateantiferromagnetic order below T_N coinciding with the superconducting orderingtemperature T_c=40 K. The incommensurability value is consistent with ahole-doping of n_h~1/8, but in contrast to non-superoxygenatedLa(2-x)Sr(x)CuO(4) with hole-doping close to n_h ~ 1/8 the magnetic orderparameter is not field-dependent. We attribute this to the magnetic order beingfully developed in LSCO+O as in the other striped lanthanum-cuprate systems.

Magnetic ordering in electronically phase separated Sr/O co-doped La(2-x)Sr(x)CuO(4+y)