Atomic shore-range order and magnetism in Pt1-xCrx alloys

Atomic short-range order and magnetism in Pt1-xCrx alloys with x = 0.07, 0. 10, 0.13, and 0.16 were studied by means of neutron scattering and suscepti bility measurements. The tatter showed a spin-glass-type anomaly at low tem perature for x=0.13 and 0.16, but a monotonic increase towards the lowest t emperature for x = 0.07 and 0.10. In neutron scattering, broad satellite pe aks with asymmetric intensities were observed for all specimens along the [ 1 0 0] direction, even at room temperature. These peaks are well explained as a concentration wave of constituent atoms accompanied with a periodic la ttice deformation. Magnetic diffuse scattering was observed for the specime ns with x=0.13 and 0.16. The origin of the spin-glass-like behavior in thes e alloys is ascribed to the dynamics and freezing of spin-density-wave clus ter fluctuations, similar to the case of CuMn spin-glass alloys. A breakdow n of the Kondo singlet state was studied for an x = 0.10 nonmagnetic alloy using neutron scattering under a magnetic field of 6 T.