Charge ordering and magneto-polarons in Na$_{0.82}$CoO$_2$

Using spectral ellipsometry, we have measured the dielectric function of a Na $_{0.82 (2)}$ CoO $_{2}$ crystal that exhibits bulk antiferromagnetism with T $_{N}$ =19.8 K. We identify two prominent transitions as a function of temperature. The first one at 280 K involves marked changes of the electronic and the lattice response that are indicative of charge ordering in the CoO $_{2}$ layers. The second transition coincides with T $_{N}$ =19.8 K and reveals a sizeable spin-charge coupling. The data are discussed in terms of charge ordering and formation of magneto-polarons due to a charge-induced spin-state transition of adjacent Co $^{3 +}$ ions.

Charge ordering and magneto-polarons in Na $_{0.82}$ CoO $_{2}$

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Charge ordering and magneto-polarons in Na $_{0.82}$ CoO $_{2}$

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Charge ordering and magneto-polarons in Na0.820.82​CoO22​

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Charge ordering and magneto-polarons in Na0.820.82​CoO22​

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Charge ordering and magneto-polarons in Na $_{0.82}$ CoO $_{2}$

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Charge ordering and magneto-polarons in Na $_{0.82}$ CoO $_{2}$

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