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Polycrystalline samples and single crystals of SmFeAs1-xPxO1-y weresynthesized and grown employing different synthesis methods and annealingconditions. Depending on the phosphorus and oxygen content, the samples areeither magnetic or superconducting. In the fully oxygenated compounds the mainimpact of phosphorus substitution is to suppress the N\'eel temperature TN ofthe spin density wave (SDW) state, and to strongly reduce the local magneticfield in the SDW state, as deduced from muon spin rotation measurements. On theother hand the superconducting state is observed in the oxygen deficientsamples only after heat treatment under high pressure. Oxygen deficiency as aresult of synthesis at high pressure brings the Sm-O layer closer to thesuperconducting As/P-Fe-As/P block and provides additional electron transfer.Interestingly, the structural modifications in response to this variation ofthe electron count are significantly different when phosphorus is partlysubstituting arsenic. Point contact spectra are well described with twosuperconducting gaps. Magnetic and resistance measurements on single crystalsindicate an in-plane magnetic penetration depth of 200 nm and an anisotropy ofthe upper critical field slope of 4-5. PACS number(s): 74.70.Xa, 74.62.Bf,74.25.-q, 81.20.-n

Interplay of composition, structure, magnetism, and superconductivity in SmFeAs1-xPxO1-y