| Monte Carlo simulations of high-moment - low-moment transitions in Invar alloys (1998) | |||||||||||||||
Abstract | |||||||||||||||
| . We have reproduced magneto-volume effects typical for Invar alloys by examining a spin-analogous model which describes coupled spatial and magnetic degrees of freedom and, additionally, chemical disorder. Constant pressure Monte Carlo simulations of this model show an almost vanishing thermal expansion over a broad range of temperatures below TC , a softening of the bulk modulus and the absence of a sharp peak in the specific heat at the magnetic phase transition as observed in Fe 65 Ni 35 Invar. Key words: magnetovolume effects -- Invar alloys -- chemical disorder 1 Introduction Since the discovery at the turn of the century that Fe 65 Ni 35 exhibits an almost vanishing thermal expansion at room temperature [1], many experimental and theoretical investigations (for recent reviews on this topic see [2, 3, 4]) have taken place in order to explore anomalously low or high thermal expansion in various materials, generally called Invar or anti-Invar effect, respectively. Especially ab i... | |||||||||||||||
Publication details | |||||||||||||||
| |||||||||||||||