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

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

2004-03-04

arxiv.org/abs/cond-mat/0403155v1

Phys. Rev. Lett. 93, 167003 (2004).

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.93.167003

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.

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