Existence of magnetic order in superconducting Nickelates?

Recently, superconductivity has been surprisingly reported at 15 K in Sr-doped NdNiO2 suggesting the existence of a new family of high-temperature superconductors. The structure of this nickel oxide consists in a stacking of NiO2 layers separated by rare-earth spacer layer, stabilizing the unusual Ni1+ oxidation state, corresponding to 3d9 electronic configuration, similarly to the cuprates. Our recent measurements bring evidence for a magnetic order in two samples, a pure and 5% Sr-doped (Nd,Sr)NiO2 that could be at the origin of magnetic fluctuations playing a key role in the emergence of superconductivity. We propose to precisely study the newly discovered antiferromagnetic phase in the (Nd1-xSrx)NiO2 x=0,0.05,0.1,0.15, the amplitude of the corresponding magnetic moment and its evolution as a function of temperature. We thus ask for 3 days on the WISH high resolution diffractometer.