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Direct evidence of a near-ideal Jeff = 1/2 ground state in triangular-lattice Na2BaCo(PO4)2

We investigated the local Co 3⁢𝑑 electronic structure of Na2⁢BaCo(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 sp...

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Autori principali: Ferreira-Carvalho, Miguel (Autore) , Chen, S. H. (Autore) , Ku, Y. C. (Autore) , Jose, Anagha (Autore) , Morrow, Ryan (Autore) , Kuo, C. Y. (Autore) , Chang, C. F. (Autore) , Hu, Z. (Autore) , Haverkort, Maurits W. (Autore) , Tjeng, L. H. (Autore)
Natura: Article (Journal)
Lingua:inglese
Pubblicazione: 26 February, 2026
In: Physical review materials
Year: 2026, Volume: 10, Fascicolo: 2, Pages: 1-7
ISSN:2475-9953
DOI:10.1103/65bn-63kj
Accesso online:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/65bn-63kj
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/65bn-63kj
Testo
Note sull'autore: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, and L.H. Tjeng
Descrizione
Riassunto:We investigated the local Co 3⁢𝑑 electronic structure of Na2⁢BaCo(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 Na2⁢BaCo(PO4)2 as a promising platform for exploring exotic magnetic phenomena associated with 𝐽eff=1/2 ground states on triangular lattices.
Descrizione del documento:Im Titel sind "eff", "2" und "4" tiefgestellt
Gesehen am 26.05.2026
Descrizione fisica:Online Resource
ISSN:2475-9953
DOI:10.1103/65bn-63kj

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