The iron-based oxypnictide superconductor SmFeAsO0.8F0.2 was synthesized under high-pressure and investigated by measuring dc magnetic susceptibility. zero-field cooled (ZFC) susceptibility confirmed the bulk superconductivity of sample with a critical temperature Tc = 50 K significant jump in magnetization at 4.3 K, usually attributed to antiferromagnetic ordering Sm3+ ions this system. Since ...