Investigation of Critical Fluctuations near T, in Ferromagnetic UTe

The spatial correlations in the long-range magnetic fluctuations near T//c have been measured in UTe by means of neutron scattering. The critical scattering above T//c was fit to a spherically symmetric Lorentzian function (d sigma /d OMEGA ) varies directly as S/(k**2 plus q**2). The inverse correlation range, k, varies from 0. 006 to 0. 150 A** minus **1.

Over a decade of reduced temperature k varies directly as t** nu with nu equals 0. 84 plus or minus 0. 05, which is greater than expected from simple theory (0. 64). Careful scans failed to detect any energy dependence in the fluctuations or anisotropy between the transverse and longitudinal components.