The temperature and field variations of the magnetization have been measured for which has a singlet ground state with an excitation gap. It is found that undergoes three-dimensional ordering in magnetic fields. The phase boundaries between the paramagnetic and ordered states are determined for and . The phase boundaries for these field directions coincide when normalized by the g -factor. The excitation gap at zero temperature is re-evaluated as .
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Oosawa et al. (1999) studied this question.
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