Temperature Dependence of Infrared Reflectivity of Chromium —Realization of Soliton Lattice Structure of Spin Density Wave—

Abstract

The temperature dependence of reflectivity of chromium is measured at energies below 1 eV. A systematic change of the reflectivity dips is observed below the Néel temperature (T_N=312 K), indicating the two energy gap structure associated with the incommensurate spin density wave state in Cr. This salient feature of the reflectivity data is successfully accounted for in terms of the soliton lattice solution for the two-band Lomer model within the mean-field approximation.