Magnetic Properties of Ho$_{1-X}$Dy$_X$Ni$_2$B$_2$C

We performed the magnetization measurement on Ho$_{1-X}$Dy$_{X}$Ni$_{2}$B$_{2}$C single crystals (x = 0.1, 0.2, 0.3, 0.4, 0.6) with magnetic field applied perpendicular and parallel to the c-axis. There exists the strong anisotropy between magnetization data for both H $\bot $ c-axis and H $\parallel$ c-axis at low temperatures, which is related with the crystalline electric field effect. The increase of Dy concentration affects the magnetically ordered states of HoNi$_{2}$B$_{2}$C compound and makes the phase diagram more complicated. The antiferromagnetic ordering state attributed to Dy$^{+3}$ sublattice starts to appear from a case of x = 0.2. Finally the magnetic phase diagram becomes analogous to that of DyNi$_{2}$B$_{2}$C as x is increased