Antiferromagnetic field intensity

Figure 15. Dependence of the thermodynamic potential on the magnetic-field intensity in the vicinity of the transition from the antiferromagnetic state to the paramagnetic one a) transition of the first type (5 > 0), b) the second type transition (5 < 0) [9,10].

For the type 3 center, the antiferromagnetic coupling leads to an S = 0 ground state that cannot split in a magnetic field. Thus, this site does not exhibit C-term intensity and the low-temperature MCD spectrum of native laccase will be dominated by the intense C-terms associated with paramagnetic copper centers (89, 90). 

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