ON THE SELF-CONSISTENT SPIN-WAVE THEORY OF FRUSTRATED HEISENBERG ANTIFERROMAGNETS

The phase diagrams of Heisenberg antiferromagnets with frustrated exchange interactions are obtained by using the self-consistent spin-wave approximation. The square, simple-cubic and quasi-1D antiferromagnets are considered with different values of spin S. An important role of spin-wave renormalizations of exchange parameters is demonstrated. The temperature dependences of the correlation length and spin-wave damping are calculated. It is shown that a wide temperature region above T(N) with a strong short-range order exists in frustrated 3D systems.