Neel temperature The susceptibility, c versus temperature, T curve for antiferromagnetic materials* is shown in fig. n1. The characteristic feature of this curve is the sharp maximum. The temperature at which this maximum occurs is called Neel temperature, T_N. Its role is similar to that of Curie temperature for ferromagnetic materials*. Above the Neel temperature the antiferromagnetic orientations are disturbed. The variation of susceptibility is given by,

c = c / (T+Q ) ( for T> T_N ) (n1)

where c is the Curie constant and is the paramagnetic Curie temperature.