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Updated: Mar 21, 2026
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Published on: July 17, 2015
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Complex incommensurate helicoidal magnetic ordering of EuNiGe3
D H Ryan1, J M Cadogan, Rasa Rejali
1Physics Department and Centre for the Physics of Materials, McGill University, 3600 University Street, Montreal, Quebec, H3A 2T8, Canada.
Summary
Europium nickel germanide (EuNiGe3) exhibits complex magnetic ordering below 12 K. Studies reveal an incommensurate helicoidal magnetic structure at low temperatures, transitioning to a sinusoidal modulation upon warming.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Understanding magnetic ordering in intermetallic compounds is crucial for developing novel magnetic materials.
- Europium-based compounds are known for their diverse magnetic properties due to the localized 4f electrons of Eu.
- The tetragonal structure (I4mm) of EuNiGe3 provides a specific crystallographic environment for magnetic interactions.
Purpose of the Study:
- To investigate the magnetic ordering behavior of the tetragonal compound EuNiGe3.
- To determine the nature of the magnetic structure and its evolution with temperature.
- To characterize the magnetic moment of the europium ions.
Main Methods:
- Utilized (151)Eu Mössbauer spectroscopy to probe the local magnetic environment of europium ions.
- Employed neutron powder diffraction to determine the crystallographic and magnetic structure.
- Analyzed magnetic ordering temperatures and propagation vectors.
Main Results:
- EuNiGe3 orders magnetically below 12 K.
- At 3.6 K, an incommensurate helicoidal magnetic structure was identified with a propagation vector of [0.16, 0.16, 0] and a Eu moment of 7.1(2) μB.
- An incommensurate sinusoidal magnetic modulation develops above 6 K and dominates by 12 K.
Conclusions:
- EuNiGe3 displays a complex, temperature-dependent magnetic structure.
- The transition from a helicoidal to a sinusoidal magnetic phase highlights the intricate magnetic interactions in this material.
- The observed magnetic properties are attributed to the interplay between the crystal structure and the localized magnetic moments of europium.
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