Abstract
We synthesized polycrystalline and single crystal samples of Nd2Co12P7 and measured magnetization of the samples to study the antiferromagnetic ground state of this compound. We confirmed that Nd2Co12P7 changes from the ferromagnetic state to the antiferromagnetic one with the decrease in temperature without magnetic phase transitions. In the antiferromagnetic state, the value of the Nd sublattice moment is 1.25 µB per Nd at H = 0, and it reaches the value of 2 µB in the saturating state achieved by a high magnetic field through a metamagnetic transition around 15 T. These values are smaller than the value expected for isolated Nd3+ ions, although the magnetic moment of Nd ions behaves like that of isolated Nd3+ ions in the paramagnetic state. The reason why the antiferromagnetic state realizes in the ferromagnetic state without magnetic phase transitions in Nd2Co12P7 is that the internal magnetic field derived from the ferromagnetic Co sublattice gradually induces the Nd sublattice moment with decreasing temperature and the values of both sublattice moments become the same around the ground state.
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