2009/07/29 by S. Bordács, I. Kézsmárki, Kenya Ohgushi +3 · 25 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Atomic physics #Band gap #Condensed matter physics #Electron #Excitation #Fermi level #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #Optical conductivity #Physics #Polarization (electrochemistry) #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1088/1367-2630/12/5/053039
published in New Journal of Physics 12(5), 053039 (IOP Publishing)
arxiv created 2009/07/29 · openalex publication_date 2010/05/26 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Diagonal and off-diagonal optical conductivity spectra have been determined from the measured reflectivity and magneto-optical Kerr effect over a broad range of photon energies in the itinerant ferromagnetic phase of CuCr 2 Se 4 at various temperatures down to T =10 K. Besides the low-energy metallic contribution and the lower-lying charge transfer transition at E ≈2 eV, a sharp and distinct optical transition was observed in the mid-infrared region around E =0.5 eV with huge magneto-optical activity. This excitation is attributed to a parity allowed transition through the Se–Cr hybridization-induced gap in the majority spin channel. The large off-diagonal conductivity is explained by the high-spin polarization in the vicinity of the Fermi level and the strong spin–orbit interaction for the related charge carriers. The results are discussed in connection with band structure calculations.