The latest achievements in the theory of 2D Heisenberg antiferromagnets are discussed within the framework of self-consistent spin-wave theories. These approaches allow to describe a smooth transition of ordered phase at T=0 into the state of strong short-range order at finite temperatures. Problems arise when generalizing for 2D and weak anisotropy cases. A consideration is given to the variant of self-consistent spin-wave theory that is suitable to overcome the problem. Temperature dependences of magnetization and short-range order are calculated and compared to experimental ones for K2NiFe4 and K2MnFe4 crystals.
|Number of pages||15|
|Journal||Fizika Metallov i Metallovedenie|
|Publication status||Published - Jan 1995|