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The oxypnictides Nd1-xSrxMnAsO have been successfully synthesised with x upto 0.1. A synchrotron X-ray diffraction study demonstrates that there is nochange in crystal symmetry upon doping with Sr. An expansion of the inter-layerdistance between Nd-O-Nd and As-Mn-As blocks is observed with increasing x.Results from variable temperature neutron diffraction and resistivitymeasurements show that the local moment antiferromagnetic order of the Mn spinsis preserved as the [MnAs]- layers are hole doped and the materials are drivenmetallic for x > 0.05. A sizeable positive magnetoresistance is observed at lowtemperature which demonstrates that multiple MR mechanisms are possible inLnMnAsO oxypnictides.

The Electronic and Magnetic Properties of Magnetoresistant Nd1-xSrxMnAsO Oxyarsenides