Charge density wave in BaFe<sub>2</sub>Al<sub>9</sub>
ORAL
Abstract
Charge density waves (CDW) are modulations of the crystal lattice that develop in crystalline materials on cooling. Generally, CDW compounds have strongly 1-d or 2-d character. In contrast, BaFe2Al9 is a hexagonal intermetallic compound with a distinctly 3-d electronic structure. Despite this, a hysteretic phase transition is observed in single crystals centered around 100K in magnetic susceptibility and resistance measurements. Diffraction and Mössbauer experiments reveal this transition is due to the formation of a CDW via a first order phase transition with a large lattice strain (-1.5% along the c-axis). Details of this modulated phase will be discussed as well as why charge order is favored over magnetic order in this metallic, iron-containing compound.
*Research supported by the U. S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory.
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Presenters
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William Meier
- Ames Laboratory, Iowa State University, Ames; Oak Ridge National Laboratory, Oak Ridge
- Oak Ridge National Lab