ABSTRACT
For T < T^ , the solution for m is nonzero and not unique
for h = 0 :
m2 = (T c - T )/cb , T < T c . ( l. 33 )
The magnitude of m is fixed, but its direction is not. The
susceptibility χ can also be worked out easily. One finds
χ a 1/(T - T), T < T . (1. 34) c c
The magnetic energy can be estimated by -h 7· m .
