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