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

C. Bernhard, A. V. Boris, N. N. Kovaleva +6

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…