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

• Published in: Journal of magnetism and magnetic materials Vol. 378; pp. 291 - 297
• Main Authors: Ding, L.J., Fan, S.W., Wang, Z.L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.03.2015
• Subjects: Cusps; Energy bands; Ferromagnetism; Frustration; Green's function; Ground state; Half-metal; Magnetic fields; Magnetism; Magnetization; Mathematical analysis; Quantum phase transition; Ferromagnetism; Green's function; Quantum phase transition; Half-metal
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2014.11.058

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. [Display omitted] •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.