Magnetic properties of the one-dimensional spin–orbital model

Abstract Magnetic properties of the one-dimensional spin–orbital model are investigated in a dimer–singlet phase. By means of the density matrix renormalization group method, we calculate the magnetization curve and the correlation functions in a magnetic field. It is found that a cusp singularity appears in the magnetization process when the ratio of the exchange couplings is properly tuned. The origin of the cusp singularity is discussed.