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Pressure-induced formation of rhodium zigzag chains in the honeycomb rhodate Li$_2$RhO$_3$
- Source :
- Phys. Rev. B 100, 064105 (2019)
- Publication Year :
- 2019
-
Abstract
- We use powder x-ray diffraction to study the effect of pressure on the crystal structure of the honeycomb rhodate Li$_2$RhO$_3$. We observe low-pressure ($P$$<$$P_{c1}$ = 6.5 GPa) and high-pressure ($P$$>$$P_{c2}$ = 14 GPa) regions corresponding to the monoclinic $C2/m$ symmetry, while a phase mixture is observed at intermediate pressures. At $P$$>$$P_{c2}$, the honeycomb structure becomes distorted and features short Rh--Rh bonds forming zigzag chains stretched along the crystallographic $a$ direction. This is in contrast to dimerized patterns observed in triclinic high-pressure polymorphs of $\alpha$-Li$_2$IrO$_3$ and $\alpha$-RuCl$_3$. Density-functional theory calculations at various pressure conditions reveal that the observed rhodium zigzag-chain pattern is not expected under hydrostatic pressure but can be reproduced by assuming anisotropic pressure conditions.<br />Comment: 11 pages, 11 figures
- Subjects :
- Condensed Matter - Strongly Correlated Electrons
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 100, 064105 (2019)
- Publication Type :
- Report
- Accession number :
- edsarx.1905.04930
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.100.064105