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Crystal Chemistry and Magnetic Properties of Manganese Zinc Alloy 'YMn2Zn20' Comprising a Mn Pyrochlore Lattice
- Publication Year :
- 2012
- Publisher :
- arXiv, 2012.
-
Abstract
- The chemical composition, crystal structure, and magnetic properties of a manganese zinc alloy with an ideal composition of YMn2Zn20, which comprises a pyrochlore lattice made of Mn atoms, are reported. The compound is stable only when In or Al is partially substituted for Zn. We have determined the actual chemical formula as YMn2+dZn20-x-dMx, with M = In or Al, and have identified the characteristic preferences with which the incorporated M and excess Mn atoms occupy the three crystallographic sites for Zn atoms. The Mn atoms in the pyrochlore lattice possess small magnetic moments that interact with each other antiferromagnetically but exhibit no long-range order above 0.4 K, probably owing to the geometrical frustration of the pyrochlore lattice. As a result, the effective mass of the conduction electrons is considerably enhanced, as observed in the related pyrochlore-lattice compounds (Y,Sc)Mn2 and LiV2O4. However, the presence of excess Mn atoms with large localized magnetic moments comparable to spin 5/2 tends to mask the inherent magnetism of the pyrochlore Mn atoms. It is suggested that "YMn2Zn18In2" with neither excess Mn atoms nor site disorder would be an ideal compound for further study.<br />Comment: 19 pages, 18 figures, accepted for publication in J. Solid State Chem
- Subjects :
- Materials science
Crystal chemistry
Magnetism
Geometrical frustration
Inorganic chemistry
Pyrochlore
chemistry.chemical_element
FOS: Physical sciences
Manganese
Crystal structure
engineering.material
Inorganic Chemistry
Condensed Matter::Materials Science
Materials Chemistry
Physical and Theoretical Chemistry
Chemical composition
Condensed Matter - Materials Science
Magnetic moment
Materials Science (cond-mat.mtrl-sci)
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Crystallography
chemistry
Ceramics and Composites
engineering
Condensed Matter::Strongly Correlated Electrons
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....682a337d7e7e83e0cecfcec2cec93ac8
- Full Text :
- https://doi.org/10.48550/arxiv.1203.4887