Direct Evidence of a Near-Ideal Jeff = 1/2 Ground State in Triangular-Lattice Na2BaCo(PO4)2
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2026
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866912890115588096 |
|---|---|
| author | Ferreira-Carvalho, M. M. Chen, S. H. Ku, Y. C. Jose, Anagha Morrow, Ryan Kuo, C. Y. Chang, C. F. Hu, Z. Haverkort, M. W. Tjeng, L. H. |
| author_facet | Ferreira-Carvalho, M. M. Chen, S. H. Ku, Y. C. Jose, Anagha Morrow, Ryan Kuo, C. Y. Chang, C. F. Hu, Z. Haverkort, M. W. Tjeng, L. H. |
| contents | We investigated the local Co 3d electronic structure of Na2BaCo(PO4)2 using polarization-dependent X-ray absorption spectroscopy (XAS) in combination with full multiplet cluster calculations. We employed the line-fitting inverse partial fluorescence yield (IPFY) technique to obtain accurate XAS spectra from strong insulating materials. Our combined experimental and theoretical analysis reveals a very small effective trigonal distortion of only 11 meV in the CoO6 octahedra, indicating a close to ideal condition to render a ground state with the Jeff = 1/2 character. With our cluster model we were also able to simulate magnetic susceptibility measurements along different directions in the crystal. These findings highlight Na2BaCo(PO4)2 as a promising platform for exploring exotic magnetic phenomena associated with Jeff = 1/2 ground states on triangular lattices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_08361 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Direct Evidence of a Near-Ideal Jeff = 1/2 Ground State in Triangular-Lattice Na2BaCo(PO4)2 Ferreira-Carvalho, M. M. Chen, S. H. Ku, Y. C. Jose, Anagha Morrow, Ryan Kuo, C. Y. Chang, C. F. Hu, Z. Haverkort, M. W. Tjeng, L. H. Strongly Correlated Electrons We investigated the local Co 3d electronic structure of Na2BaCo(PO4)2 using polarization-dependent X-ray absorption spectroscopy (XAS) in combination with full multiplet cluster calculations. We employed the line-fitting inverse partial fluorescence yield (IPFY) technique to obtain accurate XAS spectra from strong insulating materials. Our combined experimental and theoretical analysis reveals a very small effective trigonal distortion of only 11 meV in the CoO6 octahedra, indicating a close to ideal condition to render a ground state with the Jeff = 1/2 character. With our cluster model we were also able to simulate magnetic susceptibility measurements along different directions in the crystal. These findings highlight Na2BaCo(PO4)2 as a promising platform for exploring exotic magnetic phenomena associated with Jeff = 1/2 ground states on triangular lattices. |
| title | Direct Evidence of a Near-Ideal Jeff = 1/2 Ground State in Triangular-Lattice Na2BaCo(PO4)2 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2602.08361 |