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VOLUME 106 | ISSUE 5 | PAGE 297
Phase transitions in FeBO3 under pressure: DFT+DMFT study
We present a theoretical study of spectral, magnetic, and structural properties of the iron borate FeBO3. Within the DFT+DMFT method combining density functional theory with dynamical mean-field theory FeBO3 was investigated under pressures up to 70 GPa at 300 K. We found that FeBO3 is an insulator with a gap of 2.0 eV with antiferromagnetic ordering at ambient pressure in agreement with experiments. In our calculations we showed that Fe ions in FeBO3 undergo a high-spin to low-spin transition under pressure with change from antiferromagnetic to paramagnetic state, and demonstrate that the spin and magnetic transitions occur simultaneously with an isostructural transition at 50.4 GPa with the volume collapse of 13 %.

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