Abstract / Description of output
The perovskite Ca0.5Bi0.5FeO3 undergoes a remarkable sequence of charge-disproportionation (CD) and charge-transfer (CT) transitions on cooling due to competing electronic instabilities: Ca0.5Bi0.53+Fe3.5+O3 -> Ca0.5Bi0.53+Fe0.673+Fe0.334.5+O3 (CD phase) -> Ca0.5Bi0.253+Bi0.255+Fe3+O3 (CT phase). The accompanying changes in charge and spin ordering have been determined from neutron diffraction and physical property measurements. The CT phase adopts a simple G-type antiferromagnetic structure of Fe3+ spins but the CD phase adopts an unusual charge and magnetic arrangement in which Fe3+ spins are antiferromagnetically ordered but the Fe4.5+ moments have no long-range order due to magnetic frustration and form a spin glass at low temperatures.
Original language | English |
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Article number | 064434 |
Number of pages | 5 |
Journal | Physical Review B |
Volume | 96 |
Issue number | 6 |
Early online date | 29 Aug 2017 |
DOIs | |
Publication status | E-pub ahead of print - 29 Aug 2017 |
Keywords / Materials (for Non-textual outputs)
- PEROVSKITE
- CAFEO3
- IRON