Two-step-like magnetization curves of YR(CoAl)2, R=Ho, Er, in fields up to 100 T

Abstract The magnetization curves of the compounds Y 0.8 Ho 0.2 (Co 0.925 Al 0.075 ) 2 and Y 0.83 Er 0.17 (Co 0.92 Al 0.08 ) 2 have been measured in fields up to 100 T. Two metamagnetic transitions connected with magnetic instability of the d-subsystem have been observed for both compounds. Their numerical analysis within the molecular-field theory enables a precise determination of the f–d exchange parameters.