Under the hydrostatic pressure $P=1.48$ GPa, polarized neutron elastic scattering experiments have been carried out on the coupled spin dimer system TlCuCl₃ with the gapped ground state at ambient pressure. Pressure-induced magnetic ordering occurs at the transition temperature TN=16.9 K. As in the field-induced and impurity-induced magnetic ordered phases, the ordered moments lie in the $a-c$ plane just below TN. An additional spin reorientation (SR) phase transition was observed at TSR=10 K, where the ordered moments start to incline toward the b-axis. The temperature variations of the direction and the magnitude of the ordered moments were also investigated.
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Oosawa et al. (2004) studied this question.
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