We report on the charge-ordered structure of LiRh2O4 arising below the metal-insulator transition at 170 K. Structural studies using synchrotron X-rays have revealed that the charge-ordered states of Rh3+ and Rh4+ with dimerization are realized in the low-temperature phase below 170 K. Although the low-temperature ground state resembles that of CuIr2S4, a charge ordering pattern satisfying the Anderson condition is realized in LiRh2O4. 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.
@article{arxiv.2112.07118,
title = {Charge-ordered state satisfying the Anderson condition in LiRh2O4 arising from local dimer order},
author = {Manabu Shiomi and Keita Kojima and Naoyuki Katayama and Shin Maeda and John A. Schneeloch and Syunsuke Yamamoto and Koudai Sugimoto and Yukinori Ohta and Despina Louca and Yoshihiko Okamoto and Hiroshi Sawa},
journal= {arXiv preprint arXiv:2112.07118},
year = {2022}
}