American Physical Society
Infrared spectroscopy is used to investigate the electronic structure and charge carrier relaxation in crystalline films of CrO2 which is the simplest of all half-metallic ferromagnets. Chromium dioxide is a bad metal at room temperature but it has a remarkably low residual resistivity (<5 >μΩ cm) despite the small spectral weight associated with free carrier absorption. The infrared measurements show that low residual resistivity is due to the collapse of the scattering rate at ω<2000 >cm-1. The blocking of the relaxation channels at low v and T can be attributed to the unique electronic structure of a half-metallic ferromagnet. In contrast to other ferromagnetic oxides, the intraband spectral weight is constant below the Curie temperature.
Singley, E. J., Weber, C. P., Basov, D. N., Barry, A., & Coey, J. M. D. (1999). Charge dynamics in the half-metallic ferromagnet CrO 2. Physical Review B, 60(6), 4126–4130. https://doi.org/10.1103/PhysRevB.60.4126