Charge ordering and magnetopolarons in Na0.82CoO2 |
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Authors: | Bernhard C Boris A V Kovaleva N N Khaliullin G Pimenov A V Yu Li Chen D P Lin C T Keimer B |
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Affiliation: | Max-Planck-Institute for Solid State Research, Stuttgart, Germany. |
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Abstract: | Using spectral ellipsometry, we measured the dielectric function of a Na(0.82(2))CoO2 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 lattice responses that are indicative of charge ordering in the CoO2 layers. The second transition occurs around T(N)=19.8 K and reveals sizable spin-charge coupling. The data are discussed in terms of charge ordering and formation of magnetopolarons due to a charge-induced spin-state transition of adjacent Co3+ ions. |
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