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

• 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.

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.

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