Abstract
The nature of the spin-flop (SF) transition in the magnetoelectric quasi-2D Heisenberg system LiMnPO${}_{4}$ is studied in fields applied along the $a$ axis. A refinement of the magnetic structure using neutron diffraction data in the SF phase reveals that the spins reorient from being parallel to the $a$ axis to be nearly along the $c$ axis at magnetic fields between 4 and 4.7 T, depending on temperature. The low-field antiferromagnetic phase boundary is shown to join the spin-flop line tangentially at the so-called bicritical point, where there is a suppression of the ordering temperature. At the bicritical field, we observe an increased intensity of the Lorentz broadened elastic scattering at magnetic Bragg peaks above ${T}_{N}$ as compared to zero field and 10 T, without an increase in peak width. This suggests an increased density of fluctuations at the bicritical field as compared to zero field.
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