We report on the charge-ordered structure of $\mathrm{Li}{\mathrm{Rh}}_2{\mathrm{O}}_4$ arising below the metal-insulator transition at 170 K. Structural studies using synchrotron x rays have revealed that the charge-ordered states of ${\mathrm{Rh}}^{3+}$ and ${\mathrm{Rh}}^{4+}$ with dimerization are realized in the low-temperature phase below 170 K. Although the low-temperature ground state resembles that of $\mathrm{Cu}{\mathrm{Ir}}_2{\mathrm{S}}_4$, a charge-ordering pattern satisfying the Anderson condition is realized in $\mathrm{Li}{\mathrm{Rh}}_2{\mathrm{O}}_4$. Based on structural information such as the short-range order of dimers appearing above the transition temperature and the weakening of the correlation between rhodium one-dimensional chains appearing in the crystal structure, we argue that the Coulomb interaction plays an important role in determining the charge-ordering patterns.

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• Charge order
• Chemical bonding
• Exotic phases of matter
• Jahn-Teller effect
• Peierls transition
• Strongly correlated systems
• Crystal growth
• Crystal structures
• X-ray pair-distribution function analysis