https://doi.org/10.1007/s100510050231
Monte Carlo simulations of high-moment -low-moment transitions in Invar alloys
Theoretische Tieftemperaturphysik,
Gerhard-Mercator-Universität -Gesamthochschule -Duisburg,
47048 Duisburg, Germany
Corresponding author: a me@thp.uni-duisburg.de
Received:
9
September
1996
Accepted:
3
September
1997
Published online: 15 March 1998
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 Fe65Ni35 Invar.
PACS: 75.50.Bb – Fe and its alloys / 75.80.+q – Magnetomechanical and magnetoelectric effects, magnetostriction / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998