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The chemical composition, crystal structure, and magnetic properties of amanganese zinc alloy with an ideal composition of YMn2Zn20, which comprises apyrochlore lattice made of Mn atoms, are reported. The compound is stable onlywhen In or Al is partially substituted for Zn. We have determined the actualchemical formula as YMn2+dZn20-x-dMx, with M = In or Al, and have identifiedthe characteristic preferences with which the incorporated M and excess Mnatoms occupy the three crystallographic sites for Zn atoms. The Mn atoms in thepyrochlore lattice possess small magnetic moments that interact with each otherantiferromagnetically but exhibit no long-range order above 0.4 K, probablyowing to the geometrical frustration of the pyrochlore lattice. As a result,the effective mass of the conduction electrons is considerably enhanced, asobserved in the related pyrochlore-lattice compounds (Y,Sc)Mn2 and LiV2O4.However, the presence of excess Mn atoms with large localized magnetic momentscomparable to spin 5/2 tends to mask the inherent magnetism of the pyrochloreMn atoms. It is suggested that "YMn2Zn18In2" with neither excess Mn atoms norsite disorder would be an ideal compound for further study.

Crystal Chemistry and Magnetic Properties of Manganese Zinc Alloy "YMn2Zn20" Comprising a Mn Pyrochlore Lattice