Physics – Condensed Matter
Scientific paper
1997-10-24
Physics
Condensed Matter
LaTex with two EPS figures included, uses epsfig and espcrc2.sty
Scientific paper
An infinity magnon coupling term is introduced into the Holstein-Primakoff transformed forms of the Heisenberg ferromagnetic and antiferromagnetic models of any spin $s$ to rigorously remove the unphysical magnon states. This term makes the series expansion of the square root of the magnon operators become a finite series of magnon operator products. Under a simple Hubbard-like approximation our infinite coupling theory yields much better result than the existing spin wave theories, especially near transition temperatures.
Czycholl Gerd
Liu Bang-Gui
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