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We studied atomic dynamics of sigma-Fe(100-x)Cr(x) (x=45 and 49.5) alloysusing nuclear inelastic scattering of synchrotron radiation. For thesigma-Fe55Cr45 alloy, the derived reduced iron-partial density of phonon statesreveal a huge difference in the low-energy region between magnetic andparamagnetic states. The latter implies a ca.36% increase of the sound velocityin the magnetic phase, which testifies to a magnetically-induced hardening ofthe lattice.

The giant effect of magnetic ordering on a sound velocity in a sigma-Fe55Cr45 alloy