A NEUTRON-SCATTERING STUDY OF THE QUASI-ONE-DIMENSIONAL, DILUTE ISING-LIKE ANTIFERROMAGNET CSCO0.83MG0.17BR3

Neutron scattering measurements have been performed on a single-crysta l sample of CSCo0.83Mg0.17Br3, a quasi-one-dimensional, Ising-like ant iferromagnet. Residual three-dimensional interactions between the dilu te magnetic chains precipitate a phase transition to long-range order at T(N) approximately 9.0 K, and short-range correlations persist as h igh as 40 K. Relatively high-energy inelastic scattering from both ''b ulk'' spin-wave modes and ''end'' modes is observed from the finite ch ains. The low-energy inelastic spectrum is dominated by soliton scatte ring due to antiphase domain walls propagating along the finite chains .