Physics – Condensed Matter
Scientific paper
1996-03-18
Phys.Rev. B 55 (1997) 6372
Physics
Condensed Matter
9 pages, RevTex 3.0 file
Scientific paper
10.1103/PhysRevB.55.6372
The renormalization-group method is used to analyze the low-temperature behaviour of a two-dimentional, spin-$s$ quantum Heisenberg ferromagnet. A set of recursion equations is derived in an one-loop approximation. The low-temperature asymptotics of the correlation length and the uniform susceptibility are obtained. For small spins ($s= 1/2,1$) the results are essentially different from those in the spin-wave theory.
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