Abstract
We have investigated the magnetic structure of the first field-induced phase (FM-I111) of DyCu under a magnetic field applied in the [1 1 1] direction at 2.8K, which is below TN=63.0K, by means of neutron diffraction experiments using a single crystal. With the magnetic transition from the antiferromagnetic (AFM) phase to the FM-I111 phase at 8.0T, the intensity of 121¯20 reflection decreases sharply. The intensity in the FM-I111 phase is about three-fourths of the intensity in the AFM phase. This experimental result suggests that the magnetic structure model proposed by Amara et al. [J. Phys. Condens. Matter 9, 7441 (1997)] is appropriate for the FM-I111 phase. Considering the present results and the previous results reported by Amara et al., we have quantitatively evaluated the exchange and quadrupolar interaction energies based on a mean-field approximation. These interaction energies in the AFM and FM-I111 phases are found to be comparable.
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