Anomalous behavior of the Debye temperature in Fe-rich Fe-Cr alloys
Abstract
Debye temperature, D, of Fe-rich Fe100-xCrx disordered alloys with 0 x 22.3 was determined from the temperature dependence of the central shift of M\"ossbauer spectra recorded in the temperature range of 60 -- 300 K. Its compositional dependence shows a maximum at x ≈ 5 with a relative increase of 30% compared to a pure iron. The composition at which the effect occurs correlates well with that at which several other quantities, e. g. the Curie temperature and the spin-wave stiffness coefficient, D0, show their maxima, but the enhancement of D is significantly greater and comparable with the enhancement of the hyperfine field (spin-density of itinerant s-like electrons) in the studied system. The results suggest that the electron-phonon interaction is important in this alloy system.