This value appears in the denominator of a law which sets a constant divided by the quantity T minus this value equals chi, which explains why the susceptibility becomes infinite at this value.
In barium titanate, this value is the range in which the positive temperature coefficient effect can occur. This value is a linear function of defect concentration according to the Montroll-Berlin-Kac spherical model. This value appears in the denominator of a law which sets a constant divided by the quantity T minus this value equals chi, which explains why the susceptibility becomes infinite at this value. The mean-field Weiss theory is often used to compute this value. Past this point, rotation symmetry is broken in a second-order phase transition and magnetization goes to zero at this point. For 10 points, identify this temperature below which a paramagnetic material becomes ferromagnetic, named for a French physicist.
In barium titanate, this value is the range in which the positive temperature coefficient effect can occur.
Curie temperature