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The emergence of superconductivity in the iron pnictide and cuprate hightemperature superconductors usually accompanies the suppression of anantiferromagnetically (AFM) ordered state in a corresponding parent compoundthrough the use of chemical doping or external pressure1-5. A great deal ofeffort has been made to find superconductivity in Mn-based compounds6-14, whichare thought to bridge the gap between the two families of high temperaturesuperconductors7,15,16, but long-ranged AFM order was not successfullysuppressed via chemical doping in these investigations. Here we report thefirst observation of the pressure-induced elimination of long-ranged AFM orderin LaMnPO single crystals that are iso-structural to the LaFeAsOsuperconductor15,17. By combining in-situ high pressure resistance and acsusceptibility measurements, we found that LaMnPO undergoes a crossover from anAFM insulating to an AFM metallic state at a pressure ~20 GPa and that thelong-ranged AFM order collapses at a higher pressure ~32 GPa. Our findings areof importance to explore potential superconductivity in Mn-based compounds andto shed new light on the underlying mechanism of high temperaturesuperconductivity.

Observation of antiferromagnetic order collapse in the pressurized insulator LaMnPO