Experimental band structure of the nearly half-metallic CuCr$_2$Se$_4$: An optical and magneto-optical study

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

doi:10.1088/1367-2630/12/5/053039

paper

Experimental band structure of the nearly half-metallic CuCr $_{2}$ Se $_{4}$ : An optical and magneto-optical study

arXiv:0907.5087 · doi:10.1088/1367-2630/12/5/053039

Abstract

Diagonal and off-diagonal optical conductivity spectra have been determined form the measured reflectivity and magneto-optical Kerr effect (MOKE) over a broad range of photon energy 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 $E$ $\approx$ 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.

Experimental band structure of the nearly half-metallic CuCr $_{2}$ Se $_{4}$ : An optical and magneto-optical study

Abstract

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Experimental band structure of the nearly half-metallic CuCr2​Se4​: An optical and magneto-optical study

Abstract

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Experimental band structure of the nearly half-metallic CuCr $_{2}$ Se $_{4}$ : An optical and magneto-optical study