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Optical and transport properties of Fe3-xVxAl alloys

The results of investigations of the optical, electrical, and magnetic properties of Fe 3-x V x Al (x = 0-1.1) alloys are presented. Attention was primarily given to the investigation of the spectral dependence of real e 1 and imaginary e 2 parts of the dielectric constant in a wavelength range of λ = 0.25-40 μm. It is shown that the contribution from free carriers into the optical conductivity σ in the infrared (IR) region abruptly lowers and e 1 jumps to positive values in alloys with x = 0.8-1.1. The correlation between the anomalous behavior of optical characteristics in the IR region and the negative temperature coefficient of resistivity p(T) is analyzed. It has been experimentally established that the Heusler phase Fe 2 VAl with an L2 1 structure is a semimetallic antiferromagnet with a Neel temperature T N = 6.8 K without a sharp increase in p(T) at low temperatures. Semiconducting behavior of p(T) was noted only for the paramagnetic alloy Fe 1.9 V 1.1 Al. However, the high value of its optical absorption (a = 2.7 x 104 cm -1 ) in the IR region points to the fact that no truly semiconductive state is realized in this alloy. The results obtained are discussed using available data on the electronic structure of Fe 3-x Y x Al alloys.