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Large Orbital Magnetic Moment in VI3
Dávid Hovančík1, Jiří Pospíšil1, Karel Carva1
1Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16Prague 2, Czech Republic.
Nano Letters
|February 1, 2023
Summary
The orbital moment of the V3+ ion in VI3 was directly measured using X-ray magnetic circular dichroism. This confirms a significant orbital moment, crucial for understanding magnetism in this van der Waals ferromagnet.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- The nature of magnetism in the van der Waals ferromagnet VI3 remains unclear, particularly regarding the V3+-ion orbital moment.
- High magnetocrystalline anisotropy and reduced magnetic moment suggest a substantial V orbital contribution.
Purpose of the Study:
- To directly determine the orbital component of the magnetic moment in VI3.
- To provide definitive evidence for the existence and magnitude of the V3+-ion orbital moment.
Main Methods:
- Utilized X-ray magnetic circular dichroism (XMCD) spectroscopy.
- Performed ligand field multiplet simulations of XMCD spectra.
- Integrated results with density functional theory (DFT) calculations.
Main Results:
- Directly demonstrated an exceptionally sizable orbital moment for the V3+ ion in VI3.
- Identified two distinct V sites with differing orbital occupations and orbital moment (OM) magnitudes in the ground state.
- XMCD spectra and simulations corroborated DFT findings.
Conclusions:
- The V3+ ion possesses a significant orbital moment in VI3, resolving a key aspect of its magnetic nature.
- The presence of multiple V sites with varied electronic configurations influences the overall magnetism.
- This research clarifies the origin of the large magnetocrystalline anisotropy observed in VI3.
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