Magnetization and neutron diffraction studies on a polycrystalline Tb2Ti3Ge4 sample (orthorhombic Sm5Ge4-type structure, space group Pnma, No. 62) have been carried out. This compound is found to order antiferromagnetically at ~18 K (TN). The magnetization (M) versus field (H) isotherms obtained at 2, 3, 5, and 10 K indicate a field-induced antiferromagnetic to ferromagnetic transition in fields of the order of 0.5 T. The saturation magnetization value at 2.5 K (M extrapolated to 1/H-->0) is only ~5.6µB/Tb3+, suggesting the possible presence of crystal field effects with or without a persisting antiferromagnetic component. Neutron powder diffraction data at 10 K confirm the existence of a magnetic long range order. Modeling of the magnetic scattering reveals a complex and incommensurate antiferromagnetic spin structure below TN.
S. K. Malik et al., "Magnetic Ordering in the Rare Earth Intermetallic Compound Tb₂Ti₃Ge₄: Magnetization and Neutron Diffraction Studies," Journal of Applied Physics, American Institute of Physics (AIP), Feb 2009.
The definitive version is available at http://dx.doi.org/10.1063/1.3063073
Keywords and Phrases
Antiferromagnetic Materials; Crystal Field Interactions; Ferromagnetic-Antiferromagnetic Transitions; Germanium Alloys; Magnetisation; Neutron Diffraction; Terbium Alloys; Titanium Alloys
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