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Structural and magnetic properties have been studied for polycrystallineZn_1-xMn_xO (x=0.02, 0.03, 0.05). Low-temperature (~500 oC) synthesis leavesunreacted starting ZnO and manganese oxides. Contrary to a recent report, nobulk ferromagnetism was observed for single-phase materials synthesized in airat temperatures above 900 oC. Single-phase samples show paramagneticCurie-Weiss behavior.Comment: Accepted for publication in J. Appl. Phys., RevTeX, 3 pages, 4  figure

Absence of room temperature ferromagnetism in bulk Mn-doped ZnO