Renormalization-Group Approach to Spin-Wave Theory of Quantum Heisenberg Ferromagnet

Details Renormalization-Group Approach to Spin-Wave Theory of Quantum Heisenberg Ferromagnet Renormalization-Group Approach to Spin-Wave Theory of Quantum Heisenberg Ferromagnet

1996-03-18

arxiv.org/abs/cond-mat/9603123v1

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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