Above this point, ferromagnets begin to exhibit paramagnetism.
This value is a linear function of defect concentration at low concentrations according to the spherical Montroll-Berlin-Kac model. At this value, susceptibility equals infinity according to a law named for this value and Weiss. Past this value, rotation symmetry in certain materials breaks down in a second-order phase transition. It is analogous to the Neel point for an "anti" type of material. Above this point, ferromagnets begin to exhibit paramagnetism. For 10 points, give this temperature that is named for a French physicist who worked with his wife Marie on radioactivity.
This value is a linear function of defect concentration at low concentrations according to the spherical Montroll-Berlin-Kac model.
Curie temperature [or Curie point]