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Magnetic Frustration Driven by Itinerancy in Spinel CoV2O4
J H Lee1, J Ma2,3, S E Hahn4,5
1School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea. junhee@unist.ac.kr.
Scientific Reports
|December 8, 2017
Summary
In spinel CoV2O4, localized spins and itinerant electrons create a complex, non-collinear spin state due to frustration. This unusual magnetic behavior may explain spin-glass properties and is influenced by external factors.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Chemistry
Background:
- Geometrically-frustrated spinel lattices typically show limited interplay between localized spins and itinerant electrons.
- The spinel CoV2O4 presents a unique case, existing at the boundary between insulating and itinerant electronic behaviors.
Purpose of the Study:
- To investigate the origins of the anomalous spin structure in spinel CoV2O4.
- To understand the interplay between localized spins and itinerant electrons in this material.
Main Methods:
- First-principle calculations were employed to model the electronic and magnetic properties.
- Neutron diffraction measurements were conducted to experimentally verify the spin structure.
Main Results:
- Localized spins in CoV2O4 exhibit enhanced exchange couplings, leading to frustration.
- Delocalized electrons significantly influence these localized spins, resulting in a non-collinear spin state.
- This non-collinear spin state emerges even without orbital ordering, differing from typical magnetic systems.
Conclusions:
- The frustration between localized spins and itinerant electrons is identified as the key factor behind the unusual spin structure of CoV2O4.
- This spin frustration is a potential cause for the observed macroscopic spin-glass behavior.
- External perturbations like pressure and magnetic fields can tune the frustration and reveal competing magnetic phases.
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