Antiferromagnetism. The Triangular Ising Net
Abstract
In this paper the statistical mechanics of a twodimensionally infinite set of Ising spins is worked out for the case in which they form either a triangular or a honeycomb arrangement. Results for the honeycomb and the ferromagnetic triangular net differ little from the published ones for the square net (Curie point with logarithmically infinite specific heat). The triangular net with antiferromagnetic interaction is a sample case of antiferromagnetism in a nonfitting lattice. The binding energy comes out to be only onethird of what it is in the ferromagnetic case. The entropy at absolute zero is finite; it equals S(0)=R2ππ3ln(2ω)dω=0.3383R The system is disordered at all temperatures and possesses no Curie point.
 Publication:

Physical Review
 Pub Date:
 July 1950
 DOI:
 10.1103/PhysRev.79.357
 Bibcode:
 1950PhRv...79..357W