Low-Temperature Behavior of a Face-Centered Cubic Antiferromagnet

A detailed description of the ground state of a face-centered cubic antiferromagnetic system with Ising interactions is followed by an investigation of the low-temperature thermodynamic properties by means of a power series expansion of the partition function about $T=0$ ^∘{}K. This expansion has been found to be possible even though the ground state is degenerate because of the existence of a substantial amount of "partial long-range order." Expressions for the zero-field magnetic susceptibility and the specific heat are derived.