Experimental band structure of the nearly half-metallic CuCr 2Se4: An optical and magneto-optical study

S. Bordács, I. Kézsmárki, K. Ohgushi, Y. Tokura

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19 Citations (Scopus)

Abstract

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 CuCr2Se4 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.

Original languageEnglish
Article number053039
JournalNew Journal of Physics
Volume12
DOIs
Publication statusPublished - 2010 May 26
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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