Neutron diffraction study on the hyperfine-enhanced nuclear spin order of HoVO 4

Abstract

A neutron diffraction experiment on the hyperfine enhanced nuclear spin system of HoVO 4 has been carried out following adiabatic demagnetization cooling. Below 4.5 mK we observed magnetic diffraction peaks due to antiferromagnetic order of the hyperfine enhanced nuclear spin system. A spin-flop transition in an applied magnetic field of about 80 Oe was also observed. The neutron diffraction results are consistent with the magnetic structural model proposed by Bleaney on the basis of dipolar energy considerations.