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The (Li$_{1-x}$Fe$_{x}$OH)FeSe superconductor has been suspected to exhibitlong-range magnetic ordering due to Fe substitution in the LiOH layer. However,no direct observation such as magnetic reflection from neutron diffraction hasbe reported. Here, we use a chemical design strategy to manipulate the dopinglevel of transition metals in the LiOH layer to tune the magnetic properties ofthe (Li$_{1-x-y}$Fe$_{x}$Mn$_{y}$OD)FeSe system. We find Mn doping exclusivelyreplaces Li in the hydroxide layer resulting in enhanced magnetization in the(Li$_{0.876}$Fe$_{0.062}$Mn$_{0.062}$OD)FeSe superconductor withoutsignificantly altering the superconducting behavior as resolved by magneticsusceptibility and electrical/thermal transport measurements. As a result,long-range magnetic ordering was observed below 12 K with neutron diffractionmeasurements. This work has implications for the design of magneticsuperconductors for the fundamental understanding of superconductivity andmagnetism in the iron chalcogenide system as well as exploitation as functionalmaterials for next generation devices.

Long range magnetic order in hydroxide layer doped (Li$_{1-x-y}$Fe$_{x}$Mn$_{y}$OD)FeSe