The anomalous temperature dependence of the paramagnetic response of Fe-rich fcc Fe-Ni
Tieftemperaturphysik, Gerhard-Mercator Universität Duisburg, 47048 Duisburg,
2 Institut Laue-Langevin, B.P. 156, 38042 Grenoble Cedex 9, France
Accepted: 21 August 1997
Temperature dependent paramagnetic neutron scattering experiments on fcc anti-Invar alloys ( at%) show strong magnetic scattering in the foreward direction at temperatures as high as 1100 K, indicating ferromagnetic correlations although, no long-range ferromagnetic ordering occurs in the fcc state of the alloys with at%. The intensity of the magnetic scattering in the foreward direction decreases with increasing temperature for x=20 and 25 at%, it remains nearly constant with temperature for x=15 at% and shows the unusual behavior of increasing with increasing temperature for x=10 at%. The temperature dependence of the correlation length also behaves similarly.
PACS: 75.50.Bb – Fe and its alloys / 75.20.En – Metals and alloys
© EDP Sciences, 1997