A spin-1 magnetic chain with bilinear and biquadratic exchange couplings is studied to determine its phase diagram. The character of the ground state and its degeneracy is determined from an analysis of the low-lying levels of finite chains and from the instability of the uniform lattice against dimerization. Evidence for a ferromagnetic phase, two antiferromagnetic phases (with doubled and tripled periods), and a singlet phase is found.
ASJC Scopus subject areas
- Condensed Matter Physics