Abstract
Confusion has arisen about the Co spin-state transition under high pressure for multiferroic BiCoO3. The crystal structure analysis indicates a high-spin (HS) to low-spin (LS) state transition with increasing pressure, while Co Kβ X-ray emission spectra present a high-spin to intermediate-spin (IS) state transition. Herein, the spin state of Co3+ in BiCoO3 is investigated utilizing soft X-ray absorption spectroscopy (XAS) at the Co-L2,3 and O-K edges at room temperature under ambient pressure. Furthermore, the spin state transition of Co3+ under high pressure is investigated by Co Kβ X-ray emission spectra. A pure HS-Co3+ ground state is found in the BiCoO3 sample prepared from the precursor and oxidizer mixed method—and the existence of a small part of LS-Co3+ in the BiCoO3 sample prepared from the precursor and oxidizer sandwiched method. A complete HS-Co3+ to LS-Co3+ transition is observed under high pressure up to 32.3 GPa. The results clarify the debate on the spin-state transition of BiCoO3 under high pressure and will deepen our understanding of the intrinsic physical properties on it.
Original language | English |
---|---|
Article number | 2100117 |
Number of pages | 6 |
Journal | Physica Status Solidi (B) Basic Research |
Volume | 258 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2021 |
Keywords
- X-ray absorption spectroscopy
- bismuth cobaltate
- high pressure
- spin-state transition