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Condensed Matter > Strongly Correlated Electrons

arXiv:2602.08361 (cond-mat)
[Submitted on 9 Feb 2026]

Title:Direct Evidence of a Near-Ideal Jeff = 1/2 Ground State in Triangular-Lattice Na2BaCo(PO4)2

Authors:M. M. Ferreira-Carvalho, S.H. Chen, Y. C. Ku, Anagha Jose, Ryan Morrow, C. Y. Kuo, C. F. Chang, Z. Hu, M. W. Haverkort, L. H. Tjeng
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Abstract: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.
Subjects: Strongly Correlated Electrons (cond-mat.str-el)
Cite as: arXiv:2602.08361 [cond-mat.str-el]
  (or arXiv:2602.08361v1 [cond-mat.str-el] for this version)
  https://doi.org/10.48550/arXiv.2602.08361
Related DOI: https://doi.org/10.1103/65bn-63kj

Submission history

From: Miguel Maria Ferreira Carvalho [view email]
[v1] Mon, 9 Feb 2026 07:53:35 UTC (668 KB)
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