Abstract
AbstractVarious physical properties of Ni1–xAlx alloys (x = 0.248 and 0.229) have been investigated. We observed an intense absorption feature at ∼0.8 eV in the optical conductivity spectra, which was theoretically predicted. For x = 0.229 the 0.8 eV feature exhibits a double‐peak structure and it persists up to room temperature. A theoretical calculation shows that the fine structure originates from the magnetic inhomogeneity due to the appearance of the antistructure Ni atoms and their clusters. The temperature dependencies of the magneto‐optical properties can also be ascribed to the magnetic inhomogeneity. The existence of a magnetic inhomogeneity is further confirmed by DC χ(T) measurements.
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