The European Physical Journal B

ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)

Table of Contents

Abstract Volume 2 Issue 1 (1998) pp 107-119

Monte Carlo simulations of high-moment - low-moment transitions in Invar alloys

M.E. Gruner (a), R. Meyer, P. Entel

Theoretische Tieftemperaturphysik, Gerhard-Mercator-Universität - Gesamthochschule - Duisburg, 47048 Duisburg, Germany

Received: 9 September 1996 / Revised: 23 May and 23 September 1997 / accepted: 3 September 1997

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 $T_{\rm C}$,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.)

(a) email: me@thp.uni-duisburg.de

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Online publication: April 21, 1998
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