Magnetic entanglement in J1J1–J2J2 model

We study ground-state and thermal pairwise concurrence in one-dimensional frustrated spin-1/21/2 antiferromagnetic J1J1–J2J2 model embedded in a uniform magnetic field. Frustration is found to change the magnetic field dependence of concurrence qualitatively. Especially concurrence between second and third neighbors show interesting behavior around the critical values of the external magnetic field.