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arXiv · 2112.07118

Charge-ordered state satisfying the Anderson condition in LiRh2O4 arising from local dimer order

Manabu Shiomi·Keita Kojima·Naoyuki Katayama·Shin Maeda·John A. Schneeloch·Syunsuke Yamamoto·Koudai Sugimoto·Yukinori Ohta·Despina Louca·Yoshihiko Okamoto·Hiroshi Sawa
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Abstract

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.

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Manabu Shiomi, Keita Kojima, Naoyuki Katayama, Shin Maeda, John A. Schneeloch, Syunsuke Yamamoto, Koudai Sugimoto, Yukinori Ohta, Despina Louca, Yoshihiko Okamoto, Hiroshi Sawa. 2021-12-14. Charge-ordered state satisfying the Anderson condition in LiRh2O4 arising from local dimer order. https://doi.org/10.1103/physrevb.105.l041103

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