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A triplet state is also possible and is indeed favored by 0.46 eV (see Supporting Information, This would result in a solid state magnetic insulator for the extended material. To study this possibility would require further computational investigations. However, a hypothetical magnetic insulating phase would not change our reasoning signifi-cantly. This can be seen by imagining the respective enthalpy curve in Figure 2 lowered, just as a way of estimating what a magnetic phase might do. Also, pressure usually quenches (itinerant) magnetism. Thus, we may expect the triplet state to become less favorable over the singlet at high pressures
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