Angular dependence of metamagnetic transitions in HoNi2B2C

Detailed measurements of M ~2 K, H , u! of HoNi2B2C, where u is the angle that the applied field H makes with the @110# axis while remaining perpendicular to the crystallographic c axis, reveal three metamagnetic transitions with angular dependences Hc15~4.160.1 kG!/cos~u!, Hc258.460.2 kG/cos~f!, and Hc35~6.660.2 kG!/sin~f!, where f5u245 is the angle from the @100# axis. The high-field saturated moment, M sat'10mBcosu is consistent with the local moments being confined to the @110# direction. The locally saturated moments for fields between Hci ~i51,2,3! also manifest angular dependences that are consistent with combinations of local moments along @110# axes. Analysis of these data lead us to infer that the net distribution of moments is ~↑↓↑↓↑↓! for H,Hc1, ~↑↑↓↑↑↓! for Hc1,H,Hc2, ~↑↑→↑↑→! for Hc2,H,Hc3, and ~↑↑↑↑↑↑! for H.Hc3. @S0163-1829~97!02902-0#