Ferromagnetism and metal-half-metal-insulator transitions in a frustrated periodic Anderson-like organic polymer

The ferromagnetism and quantum phase transitions of a periodic Anderson-like organic polymer, in which the next-nearest-neighboring hopping results in frustration, are investigated by means of many-body Green's function theory. It is found that the ground state lies in half-metallic and paramagnetic metallic states for weak and relatively strong frustrations, respectively. At finite temperatures, a ferrimagnetic order and two different ferromagnetic phases are unveiled. In a magnetic field, in addition to 1/3 magnetization plateau, it presents three cusps and three critical fields indicating metal-half-metal and half-metal-insulator transitions, respectively, which are closely related to the energy bands controlled by the field. - Highlights: • The ferromagnetism and quantum phase transitions of a frustrated periodic Anderson-like organic polymer are investigated by Green's function theory. • At finite temperatures, a ferrimagnetic order and two different ferromagnetic phases are unveiled. • In a magnetic field, we reveal the metal-half-metal and half-metal-insulator transitions