Abstract
Polarized-neutron diffuse-scattering methods were used to determine the spatial distribution of the magnetic moments in PdMn alloys containing 0.23-, 0.46-, 0.99-, and 1.91-at.% Mn. The measurements, made on polycrystalline samples at 4.2 K in an applied field of 45 kOe, show a moment of about 4μB localized at the Mn sites. The lower-concentration cross sections tend to increase at small reciprocal-lattice vector K, as expected for such "giant-moment" systems, while the two higher-concentration alloys show an anticorrelation corresponding to Mn spin reversal and/or postitional short-range order. The cross sections are analyzed by assuming that the magnetic moment on a Pd atom depends on both its magnetic and chemical environment.