Thermoreflectance spectra of CrO2

Abstract

Measurements of the polarized thermoreflectance spectra of ferromagnetic Cr${\mathrm{O}}_2$ films in the energy range of 0.5-6.0 eV are reported. Much of the observed structure is interpreted as resulting from the narrowing of the exchange-split cationic $d$-band gap with increasing temperature, possibly caused by the increase in spin disorder. These results substantiate the conclusions made earlier from the temperature dependence of the static reflectivity spectra.