TIME-OF-FLIGHT NEUTRON-DIFFRACTION AND MAGNETIZATION INVESTIGATION OFTHE CRYSTAL AND MAGNETIC-STRUCTURE OF YCO11TI AND YCO10MO2

The crystal and magnetic structures of the tetragonal compounds YCo11T i and YCo10Mo2 (space group I-4/mmm) have been investigated by time-of -flight neutron diffraction at 293 K. A strong site preference for bot h Ti and Mo atoms is observed, with these atoms almost exclusively occ upying 8i sites. The refined Co moments at 8i, 8j and 8f sites are in agreement with magnetization measurements. The Co sublattice displays a uniaxial anisotropy for both compounds at room temperature. This is confirmed by bulk magnetization measurements using the SPD (singular p oint detection) technique. The compound YCo11Ti has been found to disp lay a spin reorientation transition from axis to plane at approximatel y 650 K.