Abstract
Neutron scattering experiments were performed on the single-crystalline DyB 2 C 2 under magnetic fields in order to elucidate the magnetic structures of field-induced phases. The measurements in the a * – c * reciprocal lattice plane under the magnetic fields along the [010] direction resulted in finding a new magnetic reflection of 1 0 3/4 in a field-induced phase (phase II ′′ ) in addition to the magnetic reflections that are common to those in the phase under a zero magnetic field (phase III). The magnetic unit cell in phase II ′′ has dimensions of a × a ×4 c , where all the Dy magnetic moments on the AFQ structure have advantageous directions to the magnetic field, and their AFQ couplings with the neighbouring moments along the c -axis are partly broken. This magnetic structure model for phase II ′′ well explains the magnetisation process at 5 K up to 14 T.
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