Quantum spin-1/2 Heisenberg ferromagnetic chains with dilute random antiferromagnetic impurity bonds were studied with the modified spin-wave theory (MSW). It was found that the zero-staggered-magnetization constraint keeps the number of spin waves finite at both the high and low temperature limit. The results suggested that the two chemical potentials were equivalent to the two kinds of Lagrangian multipliers in the Schwinger-boson mean-field study of the ferrimagnetic chains.
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy