ISSN:
1090-6487
Keywords:
75.30.Kz
;
75.50.Bb
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The magnetic phase transition in the Invar alloy Fe70Ni30 is investigated by means of small-angle neutron scattering over a wide range of momentum transfer. This method was used to measure two magnetic correlation lengths R c 1 and R c 2 which coexist in the alloy above the phase transition temperature T c . The critical correlations with correlation length R c 1 are described well by an Ornstein-Zernicke expression, and the critical correlations with the second correlation length, an order of magnitude larger than R c 2, are described well by a squared Ornstein-Zernicke expression. The temperature dependences obtained for the correlation lengths R c 1 and R c 2 satisfy the power law R c ∼((T−T c )/T c ) −υ with critical exponents υ1=0.65±0.05 and υ2=1.3±0.1 for the shorter and longer scales, respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1134/1.567483
Permalink
