Dimensional crossover driven by magnetic ordering in optical conductivity

We investigate optical properties of (Formula presented) which has A-type antiferromagnetic ordering at a low temperature. The temperature dependence of spectral weight transfer shows a clear correlation with the magnetic phase transition. Through the comparison with the results of (Formula presented) which has CE-type antiferromagnetic charge ordering, we showed that optical properties of (Formula presented) near the Néel temperature could be explained by a crossover from three-dimensional to two-dimensional metals. Details of the spectral weight changes are consistent with the polaron picture.